netdev - Re: [v2 RFC PATCH 0/4] Implement multiqueue virtio-net

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Message-ID: <OF6C412DBC.EA03FC24-ON652577B9.00228DCA-652577B9.0028232D@in.ibm.com>
Date:	Mon, 11 Oct 2010 12:51:27 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	anthony@...emonkey.ws, arnd@...db.de, avi@...hat.com,
	davem@...emloft.net, kvm@...r.kernel.org, netdev@...r.kernel.org,
	rusty@...tcorp.com.au
Subject: Re: [v2 RFC PATCH 0/4] Implement multiqueue virtio-net

"Michael S. Tsirkin" <mst@...hat.com> wrote on 10/06/2010 07:04:31 PM:

> On Fri, Sep 17, 2010 at 03:33:07PM +0530, Krishna Kumar wrote:
> > For 1 TCP netperf, I ran 7 iterations and summed it. Explanation
> > for degradation for 1 stream case:
>
> I thought about possible RX/TX contention reasons, and I realized that
> we get/put the mm counter all the time.  So I write the following: I
> haven't seen any performance gain from this in a single queue case, but
> maybe this will help multiqueue?

Sorry for the delay, I was sick last couple of days. The results
with your patch are (%'s over original code):

Code               BW%       CPU%       RemoteCPU
MQ     (#txq=16)   31.4%     38.42%     6.41%
MQ+MST (#txq=16)   28.3%     18.9%      -10.77%

The patch helps CPU utilization but didn't help single stream
drop.

Thanks,

- KK

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