Hello Laurent,
On Fri, 12 Oct 2007 01:09:07 +0200
Laurent Pinchart <[EMAIL PROTECTED]> wrote:
> Looks like it :-/ The problems you report on this mailing list have all been
> interesting so far, but next time please try to report something trivial,
> that will be less work for me :-)
ok ok :p
So, I think this may be kernel/usb-driver issue.
USB driver requests kernel to get continuous pages. and it fails.
At first, when kernel passed less uptime, most of pages are continuous
and driver works well. But these page goes smaller as time passed,
finally fails.
This usb-driver patch improves some extent, but not completely.
*** /home/momose/linux-2.6.22/drivers/usb/core/buffer.c Thu Sep 13 00:31:41 2007
--- ./buffer.c Tue Oct 9 22:57:40 2007
***************
*** 117,123 ****
if (size <= pool_max [i])
return dma_pool_alloc(hcd->pool [i], mem_flags, dma);
}
! return dma_alloc_coherent(hcd->self.controller, size, dma, 0);
}
void hcd_buffer_free(
--- 117,123 ----
if (size <= pool_max [i])
return dma_pool_alloc(hcd->pool [i], mem_flags, dma);
}
! return dma_alloc_coherent(hcd->self.controller, size, dma, __GFP_WAIT);
}
void hcd_buffer_free(
> For high-bandwidth isochronous streaming the driver allocates URB buffers
> that
> can grow to 120kB. If this puts too much pressure on your system memory, try
> to decrease UVC_MAX_ISO_PACKETS in uvcvideo.h.
I will try it. What I am playing with is a small system.
Regards,
Hirofumi Momose
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