netdev - Re: [PATCH 1/2] vhost: allow multiple workers threads

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Message-ID: <4F54BDE9.5080505@codemonkey.ws>
Date:	Mon, 05 Mar 2012 07:21:45 -0600
From:	Anthony Liguori <anthony@...emonkey.ws>
To:	netdev@...r.kernel.org
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Anthony Liguori <aliguori@...ibm.com>,
	Tom Lendacky <toml@...ibm.com>, netdev@...r.kernel.org,
	Cristian Viana <vianac@...ibm.com>
Subject: Re: [PATCH 1/2] vhost: allow multiple workers threads

On 02/20/2012 10:03 PM, Shirley Ma wrote:
> On Tue, 2012-02-21 at 05:21 +0200, Michael S. Tsirkin wrote:
>> On Mon, Feb 20, 2012 at 05:04:10PM -0800, Shirley Ma wrote:
>>> On Mon, 2012-02-20 at 23:00 +0200, Michael S. Tsirkin wrote:
>>>>
>>>> The point was really to avoid scheduler overhead
>>>> as with tcp, tx and rx tend to run on the same cpu.
>>>
>>> We have tried different approaches in the past, like splitting vhost
>>> thread to separate TX, RX threads; create per cpu vhost thread
>> instead
>>> of creating per VM per virtio_net vhost thread...
>>>
>>> We think per cpu vhost thread is a better approach based on the data
>> we
>>> have collected. It will reduce both vhost resource and scheduler
>>> overhead. It will not depend on host scheduler, has less various.
>> The
>>> patch is under testing, we hope we can post it soon.
>>>
>>> Thanks
>>> Shirley
>>
>> Yes, great, this is definitely interesting. I actually started with
>> a per-cpu one - it did not perform well but I did not
>> figure out why, switching to a single thread fixed it
>> and I did not dig into it.
>
> The patch includes per cpu vhost thread&  vhost NUMA aware scheduling

Hi Shirley,

Are you planning on posting these patches soon?

Regards,

Anthony Liguori

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