USB 2.0 isoch transfers CPU load up to 50%

Hello,

Our device use two iso endpoints. One In and one OUT.
We connect 6 devices. And on some machines the system hang. On other
we have more than 50% CPU load.

How we can decrease CPU load ?

Best regards, Alex.

bburgin
Sat Sep 27 12:29:49 CDT 2003

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Alex,

Try applying the the USB rollup QFE patch for XP available as KB 822603
(http://support.microsoft.com/default.aspx?scid=kb;[LN];822603).

Bryan S. Burgin
bburgin@microsoft.com

This posting is provided "AS IS" with no warranties, and confers no rights.
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\par Alex,
\par
\par Try applying the the USB rollup QFE patch for XP available as KB 822603 (http://support.microsoft.com/default.aspx?scid=kb;[LN];822603).
\par
\par Bryan S. Burgin
\par bburgin@microsoft.com
\par
\par This posting is provided "AS IS" with no warranties, and confers no rights.
\par
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zal
Sun Sep 28 23:25:18 CDT 2003

> Try applying the the USB rollup QFE patch for XP available as KB 822603
> (http://support.microsoft.com/default.aspx?scid=kb;[LN];822603).

I already use this patch. Each USB device take 8-16 % of CPU (in
kernel). In every device work two stream - one IN ~3 MB/s and one OUT
~0,5 MB/S. Data transfers in every microframe.

zal
Mon Sep 29 15:05:47 CDT 2003

> Try applying the the USB rollup QFE patch for XP available as KB 822603
> (