linux-kernel - Re: [PATCH] vhost_net: remove tx polling state

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Date:	Thu, 11 Apr 2013 16:16:57 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	jasowang@...hat.com, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vhost_net: remove tx polling state

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Thu, 11 Apr 2013 10:24:30 +0300

> On Thu, Apr 11, 2013 at 02:50:48PM +0800, Jason Wang wrote:
>> After commit 2b8b328b61c799957a456a5a8dab8cc7dea68575 (vhost_net: handle polling
>> errors when setting backend), we in fact track the polling state through
>> poll->wqh, so there's no need to duplicate the work with an extra
>> vhost_net_polling_state. So this patch removes this and make the code simpler.
>> 
>> This patch also removes the all tx starting/stopping code in tx path according
>> to Michael's suggestion.
>> 
>> Netperf test shows almost the same result in stream test, but gets improvements
>> on TCP_RR tests (both zerocopy or copy) especially on low load cases.
>> 
>> Tested between multiqueue kvm guest and external host with two direct
>> connected 82599s.
 ...
>> Signed-off-by: Jason Wang <jasowang@...hat.com>
> 
> Less code and better speed, what's not to like.
> Davem, could you pick this up for 3.10 please?
> 
> Acked-by: Michael S. Tsirkin <mst@...hat.com>

Applied to net-next, thanks everyone.
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