netdev - Re: [PATCH] virtio: Avoid virtio

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Message-ID: <1300381096.6315.315.camel@edumazet-laptop>
Date:	Thu, 17 Mar 2011 17:58:16 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>, kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] virtio: Avoid virtio_net TX queue over run

Le jeudi 17 mars 2011 à 09:50 -0700, Shirley Ma a écrit :
> On Thu, 2011-03-17 at 07:05 +0200, Michael S. Tsirkin wrote:
> > Could you add CPU utilization data pls? I also wonder what does this
> > do
> > to UDP?  Won't a lot of packets be dropped?
> 
> Guest CPU utilization slightly increased a few %.
> 
> UDP performance send rate increased 200% - 400%, recv rate increased
> from 10% to around 40% w/i recv errors. I will tune the buffers to see
> any better.
> 
> I am putting all data together and post the results here soon.

Could you run your tests with only one cpu ?
(offline all cpus but cpu0 on your hypervisor)

Dropping packets is fine, unless consumer cant run ;)



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