netdev - Re: [PATCH V8 0/4 net-next] macvtap/vhost TX zero-copy support

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Date:	Thu, 07 Jul 2011 04:08:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mashirle@...ibm.com
Cc:	mst@...hat.com, netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V8 0/4 net-next] macvtap/vhost TX zero-copy support

From: Shirley Ma <mashirle@...ibm.com>
Date: Wed, 06 Jul 2011 15:15:25 -0700

> This patchset add supports for TX zero-copy between guest and host
> kernel through vhost. It significantly reduces CPU utilization on the
> local host on which the guest is located (It reduced about 50% CPU usage
> for single stream test on the host, while 4K message size BW has
> increased about 50%). The patchset is based on previous submission and
> comments from the community regarding when/how to handle guest kernel
> buffers to be released. This is the simplest approach I can think of
> after comparing with several other solutions.
> 
> This patchset has integrated V3 review comments from community: 

I'm personally fine with this patch set.  Unless there are others
who object, please fix the use-after-free bug I reported, respin
the patch set, and I'll apply it.

Thanks.
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