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    SubjectRe: [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb
    On Thu, 04 Sep 2008 00:09:51 +0200
    Andi Kleen <> wrote:

    > Joerg Roedel <> writes:
    > > The SWIOTLB version of dma_alloc_coherent allocates all memory with
    > > GFP_DMA unconditionally. This leads sometimes unnecessary to allocation
    > > failures. This patch makes the allocation strategy to use the DMA32 zone
    > > first if this is possible. The changes are boot tested on AMD64 and
    > > compile tested for i386 and IA64.
    > The high level dma_alloc_coherent() does that anyways.

    The high level dma_alloc_coherent means the tricks in
    arch/x86/pci-dma.c? If so, all the tricks has gone in tip/master.

    > The swiotlb fallback really should only allocate from the swiotlb,
    > nowhere else.


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