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xen-devel
Re: [Xen-devel] Writing to a ramdisk in a PV domain is SLLLOOOWWW?!?
On 05/06/2010 03:04 PM, Santos, Jose Renato G wrote:
> This is complete wild guess, but could it be that you are doing multi-page
> I/O with non contiguous machine pages?
> I believe the DMA API for pv guests uses swioltlb which does extra copies to
> a bounce buffer if you request a dma address to a multi-page region (as the
> pages may be non contiguous).
>
Ramdisk access shouldn't be going anywhere near DMA API or swiotlb.
J
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