linux-kernel - Re: 3.0.0-rc6 ~9X system time degradation on kernbench

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Date:	Sat, 9 Jul 2011 18:48:03 -0400
From:	Kyle McMartin <kyle@...artin.ca>
To:	Rik van Riel <riel@...hat.com>
Cc:	Prarit Bhargava <prarit@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.0.0-rc6 ~9X system time degradation on kernbench

On Fri, Jul 08, 2011 at 08:45:51PM -0400, Rik van Riel wrote:
> On 07/08/2011 03:36 PM, Prarit Bhargava wrote:
> >Just some numbers out of kernbench.  System Time&  Context Switches
> >climb dramatically between 2.6.38 and 3.0.0-rc6.  Currently bisecting to
> >find out why.  .config is based on Fedora's x86_64 .config.
> 

Er, if you're using Fedora's config, did you 'make release' first?
grep DEBUG in the config and see why... ;-)

> For the record, I am also seeing dramatically increased
> CPU use with the 3.0-rc kernel, vs 2.6.38.
> 
> I first attributed it to me upgrading my video card, but
> Prarit is seeing slowdowns too, so it's not just me...
> 
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