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

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Date:	Thu, 14 Jul 2011 18:14:41 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	Kyle McMartin <kyle@...artin.ca>,
	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	Rik van Riel <riel@...hat.com>
Subject: Re: 3.0.0-rc6 ~9X system time degradation on kernbench



On 07/09/2011 06:48 PM, Kyle McMartin wrote:
> 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... ;-)
>   

That did it :)

 
Thu Jul 14 15:33:27 EDT 2011
3.0.0-rc7+
Average Optimal load -j 48 Run (std deviation):
Elapsed Time 178.384 (0.618692)
User Time 3970.09 (1.93208)
System Time 587.498 (0.511488)
Percent CPU 2554.2 (8.58487)
Context Switches 1.08771e+06 (9697.64)
Sleeps 871265 (13137.6)

Thu Jul 14 16:06:39 EDT 2011
2.6.38.8-35.fc15.x86_64
Average Optimal load -j 48 Run (std deviation):
Elapsed Time 184.6 (8.64522)
User Time 3961.07 (5.05)
System Time 637.382 (11.7187)
Percent CPU 2494.4 (102.827)
Context Switches 1.09046e+06 (3986.03)
Sleeps 873607 (4756.41)

Still a bit higher ... but not 9x ... thanks Kyle.

P.


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