linux-kernel - Re: [PATCHv3 0/6] tun zerocopy support

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Message-Id: <20120720.174902.2055189237500355771.davem@davemloft.net>
Date:	Fri, 20 Jul 2012 17:49:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	jasowang@...hat.com, eric.dumazet@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ebiederm@...ssion.com
Subject: Re: [PATCHv3 0/6] tun zerocopy support

From: "Michael S. Tsirkin" <mst@...hat.com>
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
another.

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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