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

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Message-Id: <200912161311.40644.rusty@rustcorp.com.au>
Date:	Wed, 16 Dec 2009 13:11:40 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Sridhar Samudrala <sri@...ibm.com>, mst@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] Regression in linux 2.6.32 virtio_net seen with vhost-net

On Sun, 13 Dec 2009 10:55:12 pm Herbert Xu wrote:
> Please see what a real Ethernet driver (e.g., tg3 or ixgbe) does
> for queue management.

Hi Herbert,

   Thanks for the hint.  They seem to use NAPI for xmit cleanup, so that's
what we should do?  I'll try, but such a rewrite doesn't belong in 2.6.32.

Sridhar, if you simply remove the dev_warn() does that restore some
performance?  I'll work on a proper fix for 2.6.33 now.

Thanks,
Rusty.
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