netdev - Re: Network performance with small packets

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Date:	Wed, 02 Feb 2011 07:42:51 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Sridhar Samudrala <sri@...ibm.com>,
	Steve Dobbelstein <steved@...ibm.com>,
	David Miller <davem@...emloft.net>, kvm@...r.kernel.org,
	mashirle@...ux.vnet.ibm.com, netdev@...r.kernel.org
Subject: Re: Network performance with small packets

On Wed, 2011-02-02 at 12:49 +0200, Michael S. Tsirkin wrote:
> On Tue, Feb 01, 2011 at 11:33:49PM -0800, Shirley Ma wrote:
> > On Tue, 2011-02-01 at 23:14 -0800, Shirley Ma wrote:
> > > w/i guest change, I played around the parameters,for example: I
> could
> > > get 3.7Gb/s with 42% CPU BW increasing from 2.5Gb/s for 1K message
> > > size,
> > > w/i dropping packet, I was able to get up to 6.2Gb/s with similar
> CPU
> > > usage. 
> > 
> > I meant w/o guest change, only vhost changes. Sorry about that.
> > 
> > Shirley
> 
> Ah, excellent. What were the parameters? 

I used half of the ring size 129 for packet counters, but the
performance is still not as good as dropping packets on guest, 3.7 Gb/s
vs. 6.2Gb/s.

Shirley

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