On Thursday 08 March 2007 23:05, pomidorabelisima wrote:
> hard lockup with 2.6.19-1.2911.6.5.fc6 kernel
> firmware crash with 2.6.19-1.2911.6.4.el5(fc6) kernel
> firmware crash with 2.6.20 series kernels from
> FC7/rawhide
> and
> at least 2 days uptime with 2.6.18-1.2798.fc6 kernel
> with
> DEC DMA ERROR ffffffff
> DMA ERROR ffffffff ffffffff ffffffff -1
> DMA ERROR 00000003 00000000 00000013 -1
> ENC DMA ERROR b
>
> drawing to conclusion;
> something really weard going on with 2.6.19 and 2.6.20
> series kernels
> no matter how kernels are configured
> mama mia
Ah, so you DO get DMA errors. Possible causes:
- you have a CPU frequency changer daemon running. Disable it: the PVR
hardware doesn't like that at all.
- software or hardware RAID can also cause it
- el cheapo graphics cards using main memory as the framebuffer also
cause similar problems.
- older via motherboards are particularly prone to this.
- in general, VIA MBs are more sensitive to this issue than nVidia MBs,
and Intel MBs seem to be the best.
The root cause is a buggy DMA engine and/or hardware of the cx23416. The
Hauppauge PVR500 is actually the only card that seems to avoid this
problem (mostly) due to the PCI bridge that seems to isolate the
cx23416 from most PCI DMA issues.
Regards,
Hans
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