netdev - Re: CPU utilization increased in 2.6.27rc

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Message-Id: <20080813.132750.16161628.davem@davemloft.net>
Date:	Wed, 13 Aug 2008 13:27:50 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gallatin@...i.com
Cc:	netdev@...r.kernel.org, robert@...ur.slu.se
Subject: Re: CPU utilization increased in 2.6.27rc

From: Andrew Gallatin <gallatin@...i.com>
Date: Wed, 13 Aug 2008 12:13:40 -0400

> David Miller wrote:
> > From: Andrew Gallatin <gallatin@...i.com>
> > Date: Tue, 12 Aug 2008 20:56:23 -0400
> > 
> >>      pkt_sched: Schedule qdiscs instead of netdev_queue.
> > 
> > While I'm waiting for your beforehand profile data,
> > here is a stab in the dark patch which might fix
> > the problem.
> > 
> > Robert, this could explain some of the things in the
> > multiqueue testing profile you sent me a week or so
> > ago.
> > 
> > Let me know how well it works:
> 
> Excellent!  This completely fixes the increased CPU
> utilization I observed on both 10GbE and 1GbE interfaces,
> and CPU utilization is now reduced back to 2.6.26 levels.
> 
> Oprofile now is nearly identical to what it was prior to
> 37437bb2e1ae8af470dfcd5b4ff454110894ccaf:

Thanks for testing and providing those profiles.

I'll get this fix to Linus soon.
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