Re: kernel 2.6.6 amd8111 apic bugs

[Andreas Steinmetz]

Dan Hollis wrote:
> > > > There seem to be regular dma timeouts:
> > > > hdc: dma_timer_expiry: dma status == 0x24
> > > > hdc: DMA interrupt recovery
> > > > hdc: lost interrupt
> > > > hda: dma_timer_expiry: dma status == 0x24
> > > > hda: DMA interrupt recovery
> > > > hda: lost interrupt
> > > > Hardware:
> > > > Opteron 140, Tyan Tomcat K8S (S2850)
> > >
> > > Try disabling ACPI (in .config or boot acpi=off iirc)
> >
> > I had that problem, but not with ACPI, only when I forced APIC on.  It 
> > was on the VIA controller which uses the same driver.
>
>
> Turns out it was apic and not acpi at all. Booting with ACPI but noapic 
> and I no longer get any dma errors.
>
> Is the bug in the linux apic code or a hardware flaw in the opteron cpu? 
> Or something else?

From the X86-64 patch release notes of Andi Kleen:

Reports that dual Tyan S2885 and S2880 can lock up when multiple IDE 
channels are stressed in parallel. "noapic" or "ideX=serialize" seems to 
work around it. Andre Hedrick thinks it's a generic bug/race in the IDE 
code.

Looks like you have a similar problem on a UP board.
--
Andreas Steinmetz                       SPAMmers use robotrap@xxxxxxxx
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