Re: [Xen-devel] DL385 G2 - PCI-DMA: Random memory would be DMAed

[Zachary Richmond <admin.ihsdoor@xxxxxxxxx>]

Langsdorf, Mark wrote:
> > To answer Mark's question:
> >
> >  > What kernel are you using?
> >
> > from gentoo: xen-sources-2.6.20-r6
> >
> > Regarding the full error message, all I am getting is:
> >
> >      kernel panic not syncing: PCI-DMA: Random memory would be DMAed
> >
> > since the machine is rebooting after that.  There maybe 
> > somewhere else to get more detail, but beyond dmesg or
> > messages I am not sure where else to look.
> For some reason, your kernel is running with pci-gart.c
> enabled, and dom0 is trying to allocate DMA through the
> AGP GART in your AMD64 processor's Northbridge.  I 
> didn't think Xen supported pci-gart, but maybe I missed
> a changeset.
>
> At any rate, passing iommu=soft should disable the pci-gart
> and allow you to use bounce buffering.  Hopefully, that
> should clear up your problem.
>
> -Mark Langsdorf
> Operating System Research Center
> AMD
Unfortunately I am still having the problem.  Having booted off a cd to 
preserve log files a quick grep on dmesg shows:
        PCI-DMA: Using software bounce buffering for IO (SWIOTLB)

So it is enabled, but still the kernel panic.  Any other ideas on where to poke 
around?
        Thanks,

        Zak





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