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

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Message-ID: <20091217141620.GA32534@gondor.apana.org.au>
Date:	Thu, 17 Dec 2009 22:16:20 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Krishna Kumar2 <krkumar2@...ibm.com>
Cc:	Jarek Poplawski <jarkao2@...il.com>, mst@...hat.com,
	netdev@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Sridhar Samudrala <sri@...ibm.com>
Subject: Re: [RFC PATCH] Regression in linux 2.6.32 virtio_net seen with
	vhost-net

On Thu, Dec 17, 2009 at 07:40:32PM +0530, Krishna Kumar2 wrote:
> 
> I took the numbers from Sridhar's mail before the NAPI patch. I think
> having 280K requeue's in 1 min means that the driver is waking up the
> queue when it should not. The NAPI patch fixes that, but he still
> reported seeing requeue's.

Since we're still in the dark as to why this is happening, it
would be really helpful if we could test 2.6.31's virtio-net
under 2.6.32 or vice versa to determine whether it is a driver
change or a core change that's creating this regression.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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