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Re: [Xen-devel] Is there data copy between dom0 and domU



On Wed, Apr 23, 2014 at 12:06:51PM -0400, xu cong wrote:
> When applications running in domU receive/send data from/to network, is
> there data copy via shared memory between dom0 and domU? Or the zero copy
> is used. How about the disk I/O operations? Thanks.

If you're using latest kernel (3.14-ish), guest TX path is zero-copy,
otherwise it's using copy. For RX path it always copies.

I think disk always copies data. But I'm not sure.

Wei.

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