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    SubjectRe: [PATCH] quiet down swiotlb warnings
    On Fri, Jun 01, 2007 at 04:20:38PM -0400, Rik van Riel wrote:
    > Andi Kleen wrote:
    > >On Fri, Jun 01, 2007 at 01:00:49PM -0700, Andrew Vasquez wrote:
    > >>yes, the card can support 64bit DMA transfers. but in this case the
    > >>'required' DMA mask returned from dma_get_required_mask() states that a
    > >>32bit mask would suffice.
    > >
    > >That's a bug in the kernel then that needs to be fixed. Find out
    > >why it does that and change it. Don't fix the symptoms, fix the root cause.
    > The system in question only has 2GB of memory.
    > Why would it need to do 64 bit DMA?

    It doesn't. But it definitely doesn't need swiotlb either.

    Normally swiotlb doesn't even try to bounce when dma mask is <= end_pfn
    so something must be very wrong in your kernel. It definitely isn't
    a mainline kernel. If this happens in Xen then Xen just needs fixing --
    it should not try to bounce when the normal kernel wouldn't.

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      Last update: 2007-06-01 22:29    [W:0.027 / U:62.216 seconds]
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