netdev - Re: [PATCH] virtio: Avoid virtio

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Message-ID: <1300387758.3255.56.camel@localhost.localdomain>
Date:	Thu, 17 Mar 2011 11:49:18 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	Eric Dumazet <eric.dumazet@...il.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

On Thu, 2011-03-17 at 10:01 -0700, Shirley Ma wrote:
> On Thu, 2011-03-17 at 17:58 +0100, Eric Dumazet wrote:
> > 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 ;) 
> 
> Sure, will report the data soon. 

With a single CPU, before/after with this patch the performance has no
difference for both UDP and TCP, and it seems hitting TX overrun, CPU is
100% used.

Thanks
Shirley

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