netdev - Re: [RFC PATCH] Regression in linux 2.6.32 virtio

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Message-ID: <4B29BB7A.8000307@us.ibm.com>
Date:	Wed, 16 Dec 2009 21:02:50 -0800
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Rusty Russell <rusty@...tcorp.com.au>, mst@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] Regression in linux 2.6.32 virtio_net seen with vhost-net

Herbert Xu wrote:
> On Wed, Dec 16, 2009 at 05:43:00PM -0800, Sridhar Samudrala wrote:
>   
>> I had to change virtnet_xmit_poll() to get it working. See below.
>> With this change, i don't see any 'queue full' warnings, but requeues
>> are still happening at the qdisc level (sch_direct_xmit() finds that
>> tx queue is stopped and does requeues).
>>     
>
> More importantly how does the performance look?
>   
TCP stream throughput is around the same 3200Mb/sec

Thanks
Sridhar

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