Subject: Re: [RFC PATCH] Regression in linux 2.6.32 virtio_net seen with vhost-net

From: Rusty Russell <[email-masked]>
Date: Wed, 16 Dec 2009 13:11:40 +1030

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.