maximum driver handles per process?

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  - 1
    - maximum driver handles per process? Is there a limit to the number of driver handles (one per thread) I can open from a given process? I'm using Win2k, WinXP, Win03. I remember seeing a KB article about a crash in Win2k that occures if you open too many handles to a driver. (Anyone got a source on that?) I have a project currently being tested on Win03 that causes some strange crashes. When running with five open handles it works just fine. If I bump that up to 10, the entire system goes unstable. I just want to know for sure that it is (a beast of a) bug in my code. Tag: maximum driver handles per process? Tag: 85076
  - 2
    - AVStream pin custom interface Hello, All. Please help me to find a way to implement custom COM interface for AVStream filter's pin. I want use this interface in my application to control some features of filter's pin. In steaming minidrivers architecture there was a way to cause ksproxy to load a COM server when my pin was created. It was performed declaring "HKR,PinFactory\0\Interfaces\...." in the driver's INF file. Does there is possibility to implement something similar in AVStream? Andrey Tag: maximum driver handles per process? Tag: 85069
  - 3
    - CopyFiles section [iAlmCoInst.CopyFiles] iAlmCoIn_v4299.dll,iAlmCoIn.dll,,0x00000010 I have the following CopyFiles directive in an INF file. Can someone tell me if the line in question is renaming the file to be copied? Is iAlmCoIn.dll being renamed to iAlmCoIn_v4299.dll when it is being copied onto the target machine? Thanks for your consideration, JW Tag: maximum driver handles per process? Tag: 85068
  - 4
    - SD card driver development in WinCE Hi, I am developing SD card driver for the ARM926EJS processor in winCE 5.0 here i am developing the client driver as a block driver. can i consider this as an ATA type driver? whether I have to develop the host controller driver and the bus driver or not? thanks, seshu Tag: maximum driver handles per process? Tag: 85056
  - 5
    - BusRelations and IoAttachDeviceToDeviceStack Do PDO's created upon IRP_MN_QUERY_DEVICE_RELATIONS with BusRelations requests need to be attached to the underlying FDO using IoAttachDeviceToDeviceStack? Or is the underlying FDO meant to be the top of its stack? thanks. Tag: maximum driver handles per process? Tag: 85049
  - 6
    - Problems with uninstalling drivers in Vista Hi, I have also the same problem as Venkat, who wrote on May 27 2006. Environment: Vista Ultimate Pre-RC1, build 5536, August 2006. Background: I'm trying to uninstall a pnp network unsigned driver stack using DifxApp 2.01 and have following error: DIFXAPP: ERROR - Unable to retrieve the driver store handle corresponding to componentId '{84BE9411-41F9-44DA-840C-F42DD8EA25E1}' DIFXAPP: UninstallDriverPackages failed with error 0x643 Install happens fine. I can install/uninstall the same software to Windows XP Professional/Home, to Windows 64 bit and to Windows 2000 and everything happens just fine. Venkat: Do you already have some workaround or really solution for this problem? I read from somewhere that I should use DifxApp 2.10 for installing or uninstalling drivers in Vista. Is this true? Tag: maximum driver handles per process? Tag: 85038
  - 7
    - USB2.0 descriptor issue for the full speed Hi all, I want to prepare a USB2.0 webcam driver which is planed to pass WHQL. Although it works well, but it fails USB CV test items about device qualifier and other speed descriptor. Now I have a question for the full speed descriptor and high spees descriptor. How to provide the full speed configure descriptor ? It is declared in the seperate descriptors or in the device qualifier decriptors and other speed descriptors? Does the high speed device qualifier and other speed descriptor need be declared in the full speed USB descriptor? Thanks in advance! Lily Tag: maximum driver handles per process? Tag: 85032
  - 8
    - Which is the best way for KM-UM interaction Hi all, In my project i am trying to measure performance of a PCIe Core. For that, in the driver the 8kb Core RAM is written and read through DMA. The data is written from appln to driver continuously and then DMA is done and the same data is read back in the application. Could you pls suggest which is best way for interaction and synchronisation betn appln and driver. Presently I am trying with shared mem using zwcreatesection and createfilemapping of 8kb. Can i also use IOCTLs or other routines. And how do i synchronise as appln should wait writing, till driver does dma to read and write to the core, and then appln read should happen, then again write and so on. Tag: maximum driver handles per process? Tag: 85030
  - 9
    - Getting Kernel Shared section object name in Appln Hi , I need to allocate memory in kernel mode , fill it and then user mode application has to read from it. I have created a named section object in kernel space with the name "\\device\\sharedmemory" using ZwCreateSection function. But the problem is when I use the function "CreateFileMapping", with "\\device\\sharedmemory" as its last argument, in user mode application , it fails to open the section object already created in the kernel mode. If I give different name than "\\device\\sharedmemory" in ZwCreateSection in kernel mode driver, then ZwCreateSection function fails. I am not able to figure out the problem . How to access the kernel mode memory from user mode. Please help. Thanking You Tag: maximum driver handles per process? Tag: 85029
  - 10
    - Device Instace ID Is the device instance ID extracted from the firmware of the device? I see that it often matches the HWID but not always. I don't see a specific INF directive that corresponds to the device ID so I'm wondering if that comes directly from the device hardware itself. JW Tag: maximum driver handles per process? Tag: 85022
  - 11
    - Including <ntstrsafe.h> won't work with DRIVER_TYPE=WDM When I add "DRIVER_TYPE = WDM" in my SOURCES file, the compiler can't find <ntstrsafe.h> any more. I suspect DRIVER_TYPE mess with the include directories so my question is : Should I manually add the missing include path or simply drop the DRIVER_TYPE option ? What is its purpose anyway ? Thanks for your time. Tag: maximum driver handles per process? Tag: 85019
  - 12
    - Where did drvindex.inf go in Vista? Looking at Vista Beta 2. I can't find drvindex.inf in the inf folder. Nor can I find Driver Cache\i386\ Where did they go? (I need them to extract the UniDrv core files if they aren't already on the system). Colin Tag: maximum driver handles per process? Tag: 85017
  - 13
    - sys file protector/encryptor PE encryptors are well known. Each driver can be easily reversed using for instnace IDA. Are there any windows driver file protectors? Matt Tag: maximum driver handles per process? Tag: 85015
  - 14
    - obtaining CPU usage Hello! Is it possible to obtain CPU usage by DDK API? Any suggestions how can I do so in driver mode? Thanks, Matt Tag: maximum driver handles per process? Tag: 85009
  - 15
    - Probelms with Vista RC1 Check Build Install I'm installing Vista RC1 checked on a dual-boot system. I've previously installed the free build of RC1 on this machine and everything went well. However, installing the checked built results in a frozen system. I've rebooted and gone back to the XP partition, formatted the Vista partition and tried to install the checked build twice now and the same thing happens. Does anyone know what is happening? Thanks! Tag: maximum driver handles per process? Tag: 84979
  - 16
    - Debugging NWF In Vista I'm running into a problem with my NWF driver under Vista RC1 (build 5600). This driver is for an 11n chipset and I see the following happen when the driver associates with an 11n AP: 1. The STA associates and gets an IP address. 2. If I start a ping to the gateway, the STA sends out an ARP request and the gateway sends back an ARP response. The driver then indicates the ARP response to NDIS, but the NBF is rejected for some reason. I don't see this behavior when the STA associates with an 802.11 b/g AP. I'm trying to install the checked build of 5600, but that's not going smoothly. All the same, is there any way to enable debug trace options in the NWF system so that I can get feedback on what may be happening? Also, has anyone else seen this kind of problem before? Thanks! Tag: maximum driver handles per process? Tag: 84978
  - 17
    - Proper notification/handling of KS format changes. Greetings, I have discovered a dangling pointer bug in my USB camera's UM proxy filter aggregated com object which has now raised in my mind a design question. The aggregated COM object (I'll call it the extension) provides an interface for setting various custom camera parameters to the associated Stream Class driver I have written. This interface is used by all property pages I provide for the camera and also by some custom applications we produce. Many of the parameters can change the format of the image stream. In order to be as friendly as possible, I have attempted to have the extension rebuild the filter graph when any of the format changing parameters is modified. The thinking here was that the extension, as the central object that sends IOCtrls to the KM driver, is in the best position to know which of the many parameters actually impact the image format and thus can reduce the number of times the graph needs to be rebuilt (and also reduce the amount of knowledge the caller must possess). The implementation was to derive my extension from IDistributorNotify in addition to my custom interface. In theory, this will let the extension know (via the NotifyGraphChange method) when the associated filter is added/removed from a graph, has its pins connected/unconnected, and when any other change to the graph happens. Thus in my NotifyGraphChange method, I call m_baseFilter->QueryFilterInfo(&fInf) on the camera's proxy filter and save the fInf.pGraph pointer (if it exists). Then when any relevant parameter is changed, say the X Dimension of the image, I can get the IGraphConfig from the graph and do a Reconnect. I am using the rather brute force method of Reconnect as it is my general understanding (and experience) that renegotiating a format after the initial pin connection is either not supported or completely broken depending on whether you are a Stream Class/AVStream driver and perhaps upon the Windows version. The trouble with this implementation seems to be that while NotifyGraphChange gets called in many of the listed instances, it does not get called when the filter is removed from the graph. Thus depending on the specifics of the graph manipulation, I sometimes end up with a call through an invalid m_graph pointer to Nowheresville with predictable results. While I am sure I can tiptoe around this issue by being a bit more clever (and correct for that matter) in my NotifyGraphChange analysis (for example I have observed that it is always called correctly on pin connect/disconnect and thus I could force my m_graph parameter to NULL then) I am wondering if I am really going about this in the right way. Perhaps the trouble is an abuse of IDistributorNotify. It occurred to me for example that there may be some completely different interface I have not stumbled across yet that sorts this. Or perhaps there is something that could be used from kernel mode that would be more robust (I thought there might be some standard EVENT that would do the trick for example). Is there a preferred technique for notifying a filter graph that the format has changed and the graph must be rebuilt? Or am I already on the right track? Best regards, Tom Udale Tag: maximum driver handles per process? Tag: 84977
  - 18
    - any sample code for kernel file map ? I would like to use ZwCreateSecion() to map a large file in kernel, and access it as a mapped file. Anyone has sample code to demonstrate the process and parameters in each call ? Thanks -Gary Tag: maximum driver handles per process? Tag: 84975
  - 19
    - SATA 1.0a? We have a legacy SATA tape drive that only supports SATA 1.0a. We heard there might be issues with Longhorn server if controller supports AHCI. Will Standard IDE mode (supports SATA 1.0a) still be supported for these controllers? Tag: maximum driver handles per process? Tag: 84972
  - 20
    - srbExtension and PTE depletion Hi All, I'm chasing a driver bug and though you might be able to help me out. I have an LSI SCSI driver which allocates enough memory in the srbExtension to fit a whole filesystem cluster. With WinXPSP2 (SP1 doesn't do this), if I drag a folder with many (100,000) 128KB files onto a volume managed by this driver, the kernel loses Page Table Entries as the copy progresses. I can track this loss in perfmon by watching the Memory->Free System Page Table Entries counter. Lost PTEs are never recovered, and when the kernel gets down to about 4000, it's game over, and the OS throws an "Insufficient Resources Exist to Complete the Requested Service" dialog. I have a similar Adaptec driver which only allocates 4 bytes in the srbExtension, and it does not trigger PTE loss. Large NTFS cluster sizes exacerbate the behavior. I recently tested a Core 2 Duo laptop, and its internal SATA driver, as well as an eSATA ExpressCard both exhibit this behaviour, so it appears that drivers provoking this bug are becoming more widespread. Has anyone developing SCSI drivers seen this issue, or has anyone at MS filed a bug? If so, when can I hope for a fix? Thanks, David Tag: maximum driver handles per process? Tag: 84953
  - 21
    - USB suspend issues I'm using the microchip custom firmware with my USB device and I'm having problems with the the computer constantly trying to suspend the device. It makes the device respond slowly and sporadically. When I uncheck the box "Allow the computer to turn this device off to save power" in the Power Management tab of the device in the device manager, the device works much better. Is there any way in the device descriptor or inf file to tell the computer it shouldn't be trying to shut this device down constantly? Or do I need to make a WMI call as part of the driver install to uncheck that check box? Any help is appreciated. Thanks, Clint Tag: maximum driver handles per process? Tag: 84951
  - 22
    - PNP stop/remove and the current IRP When a device is either stopped or removed, shouldn't the current IRP for which there was I/O in progress be completed before finishing the stop/remove PNP request? When I look at the WDM book examples, I see the device's IRP queue being either stalled or aborted, but I'm unsure about the way the I/O in progress is handled. Both stop and remove look like they either wait for the current I/O to finish or cause the device hardware to abort it, but shouldn't they also complete the IRP associated with that I/O? (either with success in the stop/wait case or error in the remove/abort case) Tag: maximum driver handles per process? Tag: 84950
  - 23
    - NdisQueryBufferSafe returns zero buffer length when NdisQueryPacket says there is more data MiniportSendPacket()... NdisQueryPacket says the total length is 142 say and the packet has 3 buffers. Buffer 1 is 14 length Buffer 2 is 20 length Buffer 3 is 0 length So the Ethernet and IP header are there, the payload is missing. The Packet type is ESP. A Nortel VPN client on the PC. If DNE is run on the PC, the third buffer has the correct length of 108. Any ideas on this? Tag: maximum driver handles per process? Tag: 84939
  - 24
    - microsoft CCID & extended APDU I am currently writing firmware for a smartcard reader that should conform to the CCID USB protocol. The idea is that it should work with the Microsoft generic CCID driver usbccid.sys. Everything work as it should when sending & receiving short APDU's (256 bytes + 10 bytes CCID header). Sending extended APDUs to the reader (pc_to_rdr_xfr block) also works with sizes up to 0xffff (as specified in ISO7816). However when attempting to receive extended APDUs from the reader I get the following error: TransferFlags OUT, SHORT_TRANSFER_OK TransferBufferLength 269 bytes status: URB Status USBD_STATUS_BUFFER_OVERRUN TransferFlags IN, SHORT_TRANSFER_OK TransferBufferLength 256 bytes As far as I can see the driver doesn't allocate enough size in the receive buffer and the reader attempts to send more data than 256. Does anyone know the status of the Microsoft CCID driver and / or what can be done in order to use the extended APDU's in rdr_to_pc_xfr blocks ? The current CCID descriptor that we are using and the card ATR is as follows: static CCID_Desc CCID_desc[1] = { 0x36, 0x21, // Length, Type=CCID 0x01, 0x10, // CCID spec release number 0, // Max slot index 0x01, // 3V, 5V supported 0x02, 0x00, 0x00, 0x00, // dwProtocols = T=1 0xa0, 0x0f, 0x00, 0x00, // default clock frequency = 4000 kHz 0x4c, 0x1d, 0x00, 0x00, // max clock frequency = 7500 kHz 0x00, // no manual clock selection 0x01, 0x2a, 0x00, 0x00, // default data rate = 10.75 kbps 0x10, 0xb1, 0x03, 0x00, // max data rate = 241.9 kbps 0x00, // no manual speed setting 0xfe, 0x00, 0x00, 0x00, // max IFSD 0x00, 0x00, 0x00, 0x00, // dwSynchProtocols, not supported 0x00, 0x00, 0x00, 0x00, // dwMechanical, no special characteristics 0xba, 0x00, 0x04, 0x00, // dwFeautures - APDU level, automatic TA & freq settings 9a, 0x12, // dwMaxCCIDMessageLength 0x00, // 0x01, // 0x00, // 0x00, 0x00, // bClassGetResponse, bClassEnvelope 0x00, 0x00, // wLcdLayout = no LCD 0x00, // bPinSupport = No PIN 0x01, // bMaxCCIDBusySlots = 1 }; Card ATR uchar fakeATR[] = { 0x3b, // TS 0xb5, // T0 0x11, // TA1 0x00, // TB1 0x81, // TD1 0x31, // TD2 0x46, // TA3 0x15, // TB3 0x56, 0x20, 0x31, 0x2e, 0x30, //T1-T5 = "V 1.0" 0x1e}; // TCK Tag: maximum driver handles per process? Tag: 84925
  - 25
    - Shared Memory Creation Hi all, I am trying to create shared memory from the driver Using ZwCreateSection(), but in my XP DDK used for compilation, its giving undeclared identifier. Why is this not included in ntddk.h? and how to create 8 kb of memory betn Appln and kernel and synchronise. Please suggest, Thanks, Chin Tag: maximum driver handles per process? Tag: 84919
- Next
  - 1
    - How to send URB and IRP to user mode application? Hello All I am trying to capture URB for USB devices, I have written some code for that, Now my goal is to transfer all those URB's to user mode application for further processing, I am not getting how to send URB's and IRP's to user mode application, Could anyone tell me how to send URB to user mode application, user mode application would access this data for further processing. It would be great if some one explains me using some code. -AJay Tag: maximum driver handles per process? Tag: 84917
  - 2
    - Disk spin down Hi All, I have a question on how the disk spin down is affected for a SATA hard drive. Would the windows storage stack send a START STOP UNIT command to stop the disk? regards vs Tag: maximum driver handles per process? Tag: 84916
  - 3
    - Stall flag vs. remove lock I've been looking at the WDM book queueing example and it seems there are two similar methods for making sure driver activity has ceased before removing a device: stallcount/WaitForCurrentIrp() and: IoAcquireRemoveLock()/IoReleaseRemoveLock()/IoReleaseRemoveLockAndWait() The idea behind the first method is to prevent any new device I/O from being initiated and wait for the current I/O to finish. The idea behind the second method is to prevent any new IRPs from being forwarded to a lower driver and wait for the current IRPs forwarded to a lower driver to complete (so that the driver can't finish the next IRP_MN_REMOVE_DEVICE it might receive until those IRPs are completed). The ideas are very similar. They both center around whether some operation is in progress, whether the device is "busy". It seems like with some code changes, a single method would work, one that simply controls whether the device is currently busy and/or in the process of removal and can wait until the device is no longer busy. Tag: maximum driver handles per process? Tag: 84897
  - 4
    - __readmsr and __writemsr usage HI, Has anyone used "__readmsr and __writemsr" while writing device drivers for windows. These are intrinsic functions in VC++. Not sure how to use it to read MSR values. A sample code demonstrating these command will be helpful. When I try to use them I get a bunch of Linking errors. Thanks NM Tag: maximum driver handles per process? Tag: 84893
  - 5
    - [KMDF USB] My DeviceAdd is being called twice for one device! Yeah, it's me again. This time, I have a composite device here that is configured like the below. Interface 0: - bulk IN endpoint - bulk OUT endpoint - interrupt IN endpoint Interface 1: - bulk IN endpoint - bulk OUT endpoint I load the generic parent driver (usbhub, I'm on Win2k) for this device which then enumerates two child devices. So far, so good. I am using the same function driver binary for both interfaces (PDOs) -- although it is set up with a different service name and different binary name in the other INF file. If the interrupt endpoint is not seen, the driver just removes some functionality on the fly. If it matters, the first interface is "modem" class and the second is "ports" class. I call WdfDeviceCreateDeviceInterface conditionally, either passing GUID_DEVINTERFACE_MODEM or GUID_DEVINTERFACE_COMPORT. I can load my function driver successfully on the first interface without any trouble. When it loads on the second, I am getting *two* calls into my AddDevice routine, and *two* calls into my PrepareHardware. Inside PrepareHardware, I can see that the two WDFDEVICE handles that I'm given are different (say, 0x7CAD0FF8 versus 0x7CA97FF8). Naturally, when I go to call WdfUsbTargetDeviceCreate() inside PrepareHardware, the second call fails out. I can't even fathom a guess as to why this happens. Any ideas? Tag: maximum driver handles per process? Tag: 84892
  - 6
    - Query remove and usage concurrence In the example from the WDM book, IRP_MN_QUERY_REMOVE_DEVICE and IRP_MN_QUERY_STOP_DEVICE determine whether it's okay to remove/stop the device by checking some counters (hibernation, paging, dump) that are incremented/decremented in IRP_MN_DEVICE_USAGE_NOTIFICATION to indicate the types of things the device is used for, but it doesn't look like there's any guard to prevent the counters from being incremented during or after a remove is in progress. Isn't IRP_MN_DEVICE_USAGE_NOTIFICATION one of the PNP IRPs that could happen concurrently with the other PNP IRPs and cause one of these usage counters to successfully increment even after it's been determined the device can be removed? Tag: maximum driver handles per process? Tag: 84886
  - 7
    - WIA Microdriver Default Paper Source I'm writing a WIA microdriver and I would like the default paper source to be the document feeder, rather than the flatbed. I'm kind of hoping that, as there is for the supported resolutions, there might be an INF entry that I could set that would make the default paper source be the ADF. Does anyone know if such an INF entry (or anything else that would accomplish this goal) exists? Tag: maximum driver handles per process? Tag: 84885
  - 8
    - Develop Filter drivers to hide files Hello, I am trying to learn about the magic of file system drivers and I thought that an interesting project would be to develop a filter driver that would hide specific files. I am guessing that it would be something as simple as ignoring some requests to seek some files. would anyone be willing to post some resources that could lead me on my way? I checked through the Windows DDK and was unable to locate anything that would be of interested. Thank you for your time. Tag: maximum driver handles per process? Tag: 84880
  - 9
    - how to get driver letter from DevicePath? Hi everyone, Anyone knows how to get the Cd-Rom's driver letter (e.g. c:\, d:\...) 1. from DevicePath which is returned by SetupDiGetDeviceInterfaceDetail? (e.g. \\?\usbstor#cdrom&ven_storage&prod_photo_guardian&rev_2.00#00000a544861&1#{53f56308-b6bf-11d0-94f2-00a0c91efb8b}) 2. or from DiskNumber (e.g. CD-ROM 1, CD-ROM 2)? Thanks for your help and have a good day. Yours, Michael, zhang Tag: maximum driver handles per process? Tag: 84872
  - 10
    - driver installation problem I have taken a sample driver from the WDK and added some test code in an attempt to test drive the ista driver scene. Although the driver can be built and installed on other platforms, when I try to install it on Vista I get the following error after using Have Disk to locate the inf file: "The folder you specified doesn't contain a compatible software driver for your device. If the folder contains a driver, make sure it is designed to work with Windows for 32-bit systems." The driver was built from the sample with only cosmetic changes to the INF. Any ideas what generates this error message? I have tried to debug it with the setupapi logs but the log data doesn't differ between a successful install of the sample vs. my driver. any suggestions? Tag: maximum driver handles per process? Tag: 84871
  - 11
    - 32 bit coinstaller in x64 I have a 32-bit coinstaller. Can I install this on an x64 machine. The driver itself is 64 bit. Please tell me if I should move the coinstaller to 64-bit. Any links to msdn where this is discussed would help. Thanks Tag: maximum driver handles per process? Tag: 84868
  - 12
    - WinXP resource outage Hi, a bus driver that I test does not have enough resources to load. Its power state is D3, with XP SP2 installed. The device status as taken from the Device Properties page shows this message: This device cannot find enough free resources that it can use. (Code 12) If you want to use this device, you will need to disable one of the other devices on this system. Click Troubleshoot to start the troubleshooter for this device. And the resources pane shows the same thing. I have read that this error can occur mostly due to shared intterupt lines, but there are no reported conflicts. I also used DeviceTree tool from OSR without finding anything new. Memory usage for this PC has this status: Physical Memory Available - 127 M Kernel Memory Total - 23 M Kernel Memory Paged - 17 M Kernel Memory NonPaged - 6 M I would appreciate your suggestions, Calin Tag: maximum driver handles per process? Tag: 84861
  - 13
    - Perform Task upon print finish.(OEMUNI) Hi all, I am writing bitmap printer driver, i have modified OEMUNI sample and after lots of efforts i am able to generate the bmp files as output of print command. Now, I want to notify the completion of this job to my user-mode UI. Can I Send message to my UI from oemuni.dll--oemenddoc()? Can I do CreateProcess from oemuni.dll--oemenddoc() ? Do i Need to write Ui-plugin dll for printer driver? if so which source code of DDK,XP, i need to look up? and which functions i need to override? Which approach should be taken into account? I also want to have my bmp file to be fixed height/width based on portrait mode or landscape mode ? how to achive this? How to Set page margins (top, left, etc) to zero or some fixed values rather than rely on user? For this do i need to have ui-dll? which source code i need to look at? is it oemui or psuirep? Thanks in advance jrc Regards, jrc Tag: maximum driver handles per process? Tag: 84857
  - 14
    - Repost: Base Address for DbgHelp.dll The base address for the DbgHelp.dll that's distributed with Windows XP is 0x59A60000. The base address for the one from 8/29/2002 is 0x6D510000. Another recorded base address I have is 0x4bde0000. The base address for the one from July 2006 is 0x03000000. Why does this keep changing? It makes it *really* difficult to make sure that your program doesn't have base address conflicts when these other components keep moving around. Tag: maximum driver handles per process? Tag: 84853
  - 15
    - 4 Full speed isochronous->1 High speed isochronous = 100% CPU We are using 4 USB audio device (PCM2902, manufacturer TI) connected to the Southbridge ( 82801 GB/GR, Manufacturer Intel, a.k.a. ICH7) of a motherboard through a Multi-TT high speed USB Hub (2507, manufacturer SMSC). It means that there are four periodical isochronous full-speed streams that are converted to one High-speed USB stream by the Hub, before being sent to EHCI controller of the Southbridge. Software configuration is Windows XP (Professional) SP2 with auto-update activated. (Kernel Version 5.1.2600.2180) In this configuration, there is a high increase of CPU load (peak to 100%) when audio channels are all activated in both direction (Wave In, Wave Out). It induced lost of many audio frame and lost of audio stream. Another interesting test has been done connecting directly the four USB audio devices directly to Southbridge UHCI controller (i.e. using 4 full-speed USB stream). In this case, it operates correctly (less than 20% CPU load without lost of audio frame), what validated our software. Is it a way to use the USB Hub in High speed mode without having the CPU reaching 100%? Thanks Blaise Tag: maximum driver handles per process? Tag: 84852
  - 16
    - FAT32 File system I need help on the FAT32 file system implementation. Please clarify this doubts. - How does the OS find the size of the new device when the device is formatted? In floppy where the size of the floppy is stored.? - How much space we need to allocate for FAT table in FAT32 file system? Thanks! Tag: maximum driver handles per process? Tag: 84851
  - 17
    - strange behaviour of tagged pool Hi, I have an NDIS 5.1 miniport. In order to test some mechanism I built I inserted some calls to NdisAllocateMemoryWithTag in the checkforhang callback. This means that every few seconds I allocated a chunk of memory, I did not free it or even read or wrote to it - just allocated it. I used both Poolmon.exe and also !poolusage from WinDbg to monitor pools status and in both cases I got the same results: When the allocated size was 4081 and higher both Poolmon and !poolusage show me that the tagged pool allocations are indeed increased i.e. I saw an evidence to the allocations. But when the allocation size was 4080 or lower neither poolmon or !poolusage showed me any indication to the allocation from the tagged pool. The pool's statistics were unchanged and (I made sure through the debugger that NdisAllocateMemoryWithTag is indeed called). Any idea what is the reason for that? Thanks Miki Tag: maximum driver handles per process? Tag: 84850
  - 18
    - Sharing interruot between two drivers for the same interface Hi, Can the interrupt be shared between -two drivers on PCI interface, one of the driver being Ndis miniport for that particular interface ? -two drivers on PCMCIA interface, one of the driver being Ndis miniport for that particular interface ? - two driver on USM interface, one of the driver being Ndis miniport for that particular interface ? If so, is status = IoConnectInterrupt( &DeviceExtension->InterruptObject, BcmIrqServiceRoutine, (PVOID) DeviceExtension, NULL, Vector, Irql, Irql, Mode, Shared, Affinity, FALSE ); is the function used in all the non-ndis driver with shared attib and in Ndis the called used is Status = NdisMRegisterInterrupt(&Adapter->Interrupt, AdapterHandle, AiVector, // bus-relative vector number used by the NIC. AiInterrupt, // bus-relative DIRQL for the interrupt TRUE, // MiniportISR function should be called each time the NIC interrupts TRUE, // Other devices on the I/O bus can use this interrupt line InterruptMode); // using LevelSensitive Inerrupts ... even in non-ndis and ndis on USB interface also call the same function to share the interrupts ? Regards Esha Tag: maximum driver handles per process? Tag: 84848
  - 19
    - multipath on Longhorn Hi Everybody, I'd like to do the FC multipath test on Longhorn. http://www.microsoft.com/WindowsServer2003/technologies/storage/mpio/faq.mspx > Q. Are there any plans to release an "Industry Standard" Device Specific > Module (DSM) for Fibre Channel? > A. Yes. The Microsoft industry-standard DSM for Fibre Channel is planned for > inclusion in Microsoft Windows Server code-named Longhorn. I read this news, and I tried to configure FC multipath, but I could't configure the multipath. Please teach the procedure how to configure multipath by using "Industry Standard" DSM for FC which is included in Longhorn. (or has not been included yet?) Longhorn : beta2 Enterprise Edition 32bit HBA : LP9802 * 2 Thanks Tag: maximum driver handles per process? Tag: 84846
  - 20
    - KMDF & USB isochronous Hello, I'm currently evaluating KMDF for an USB Driver. Our device is based on Cypress FX2 chip. We stream video trough EP2 configured as IN Isochronous (High Bandwith device - 2*724 bytes per =B5frame). When looking in the documentation (Version 1.1 of the framework), I see that WdfUsbTargetPipeFormatRequestForRead method must be used with a Bulk or Interrupt Pipe. So I assume that an Isochronous Pipe is not a valid pipe for this method. I also saw that the framework has a continuous reader. But my understanding of this reader is that it's purpose is only for intrinsically asynchronous events (like a change in a device state). As this continous reader doesn't have a limitation on which kind of pipe it use, can I use it for my application ? So my question : What is the right method to use a High Bandwidth Isochronous streaming device with KMDF ? Should I create URB's instead ? I must add that while our device streams video. It's not recognized as a steraming device under windows, that is we do not use directshow or other AVStream interface. So the fact that is video that is currently streamed has little importance. Thanks, Fred. Tag: maximum driver handles per process? Tag: 84840
  - 21
    - About calling User mode functions. Respected Sir, I have a kernel-mode dll, through which I want to call User-Mode Functions. I would like to know asto how can I do so in correct manner ? regards, Sudhanshu Tag: maximum driver handles per process? Tag: 84830
  - 22
    - accessing ttl field from windows filtering platform? I have an odd but simple requirement that I need to see the ttl field and check its value from incoming IP packets. Currently we do this using a simple .sys filter driver (TDI area). This is not really going to work too well for Vista platforms. I would like to use the Windows Filtering Platform to do this task. Is it even possible to check the TTL field of incoming IP packets using WFP? How would I do this? I have not been able to figure this out from the msdn documentation/library I have found. Thanks for the help. Jay Tag: maximum driver handles per process? Tag: 84812
  - 23
    - WinXPSP2, Intel Core2Duo, Kernel drivers Hello, I write experimental drivers, and have never worked on SMP systems yet. I need to upgrade to an IBM T60 but I am worried about the dual-core Intel processor engine. I have the following questions: - It seems the dual-core provides 2 pipelines and 2 caches to 2 cores on a single die. This sounds like a SMP system. Will my drivers have to worry about SMP stuff? - Can I configured Windows XP SP2/BIOS to completely disable/ignore one of the cores when I write my drivers? Will there be a major performance impact if I did this? I read that Windows installs a different HAL when it sees an SMP... so it sounds like I cant do this at boot time each time.. it has to be a one-time decision during installation? Basically, I want to know if I can write non-SMP aware drivers in someway on a IBM T60 that has a core2duo processor engine. Thanks! Tag: maximum driver handles per process? Tag: 84810
  - 24
    - SetupDiCallClassInstaller on Vista I have been using SetupDiCallClassInstaller with DIF_REMOVE to uninstall PCI devices on W2K and XP. This does not appear to work properly on Vista CTP (5472). There is no error returned, i.e, the call to SetupDiCallClassInstaller succeeds, but the device is still installed. Is this a known problem with Vista, or did something change in regards to using the SetupDiXXX API? Thanks, Harry Tag: maximum driver handles per process? Tag: 84805
  - 25
    - WdfIoTargetStop calls FxUsbPipe::WaitForSentIoToComplete even with WdfIoTargetLeaveSentIoPending? I've set up a completion routine for a bulk endpoint continuous reader using KMDF which reads data into a buffer. If my buffer is about to overflow, I want to stop the reader until the buffer is emptied by my application. I'm at DISPATCH_LEVEL inside the completion routine, so I call WdfIoTargetStop() with argument WdfIoTargetLeaveSentIoPending. According to the docs, this is the only way it's acceptable to call WdfIoTargetStop at IRQL <= DISPATCH_LEVEL. However, this still blue screens for me. When I look at the stack backtrace, it looks like WDF is still trying to wait for some sort of cleanup, which causes the blue screen. You can also see from the trace that I passed 0x00000003 to WdfIoTargetStop() which is the enumerated value for leave-sent-IO-pending. Any ideas? 8047166c f38d1aef 8365e748 8364e690 00000000 Wdf01000!FxUsbPipeContinuousReader::CancelRepeaters+0x31 8047167c f38ca634 8364e690 00000000 00000000 Wdf01000!FxUsbPipe::WaitForSentIoToComplete+0x109 80471694 f38c613d 00000003 83b940d0 8364e690 Wdf01000!FxIoTarget::Stop+0x41 804716b0 f396d61a 8365e800 7c9b1968 00000003 Wdf01000!imp_WdfIoTargetStop+0xba 804716c4 f39713d2 7c9b1968 00000003 54434163 xxx!WdfIoTargetStop+0x1a [...kmdf10\inc\wdfiotarget.h @ 375] 80471700 f38d2272 7c9b1968 7c9c3ff0 00000003 xxx!xxxEvtBulkInCompletion+0xe2 [c:\xxx\readwrit.c @ 326] 80471730 f38f270d 7c97a1c8 7c9b1968 83653b14 Wdf01000!FxUsbPipeContinuousReader::_FxUsbPipeRequestComplete+0x3e 80471758 f38cb1dc ae08bff8 8364e690 00000000 Wdf01000!FxRequestBase::CompleteSubmitted+0x89 80471774 f38cb296 01685e30 ae08bf00 804717cc Wdf01000!FxIoTarget::RequestCompletionRoutine+0x195 80471784 80528ee6 00000000 ae08bf00 83685e30 Wdf01000!FxIoTarget::_RequestCompletionRoutine+0x35 804717cc f742e8ae ae08bf00 83679568 85e39028 nt!IovSpecialIrpCompleteRequest+0x18c 80471820 f742e5a1 46616d64 43707269 00000000 USBPORT!USBPORT_CompleteTransfer+0x306 80471850 f742fdcd 546e6f02 80464224 83651708 USBPORT!USBPORT_DoneTransfer+0x135 8047187c f74324c8 85e39028 80464224 85e391f0 USBPORT!USBPORT_FlushDoneTransferList+0x15f 804718ac f74401a1 85e39028 80464224 85e39028 USBPORT!USBPORT_DpcWorker+0x2d2 804718f4 f7440309 85e39028 00000001 8046d6f0 USBPORT!USBPORT_IsrDpcWorker+0x36f 80471910 804644c7 85e39608 6b755044 00000000 USBPORT!USBPORT_IsrDpc+0x15b 80471924 80464462 0000000e 00000000 00000000 nt!KiRetireDpcList+0x30 ffdff800 85e3962c 00000001 80471928 0006e721 nt!KiIdleLoop+0x26 WARNING: Frame IP not in any known module. Following frames may be wrong. ffdff804 00000000 80471928 0006e721 0006e718 0x85e3962c Tag: maximum driver handles per process? Tag: 84796

Is there a limit to the number of driver handles (one per thread) I can
open from a given process? I'm using Win2k, WinXP, Win03. I remember
seeing a KB article about a crash in Win2k that occures if you open too
many handles to a driver. (Anyone got a source on that?) I have a
project currently being tested on Win03 that causes some strange
crashes. When running with five open handles it works just fine. If I
bump that up to 10, the entire system goes unstable. I just want to
know for sure that it is (a beast of a) bug in my code.

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