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SubjectRe: [PATCHv3 0/6] tun zerocopy support
From: "Michael S. Tsirkin" <>
Date: Fri, 20 Jul 2012 22:23:03 +0300

> Same as with macvtap, I get single-percentage wins in CPU utilization
> on guest to external from this patchset, and a performance regression on
> guest to host, so more work is needed until this feature can move out of
> experimental status, but I think it's useful for some people already.
> Pls review and consider for 3.6.

It doesn't improve performance in one case, and hurts performance in

You'll have to give me a more compelling argument than that. You've
just given me every reason not to include these patches in 3.6

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