linux-kernel - Re: CFS: some bad numbers with Java/database threading [FIXED]

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Date:	Tue, 18 Sep 2007 13:00:07 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Antoine Martin <antoine@...afix.co.uk>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: CFS: some bad numbers with Java/database threading [FIXED]

On 09/14/2007 11:32 AM, Ingo Molnar wrote:
> * Antoine Martin <antoine@...afix.co.uk> wrote:
> 
>>>> have an impact) Keep CONFIG_SCHED_DEBUG=y to be able to twiddle the
>>>> sysctl.
>> It looks good now! Updated results here:
>> http://devloop.org.uk/documentation/database-performance/Linux-Kernels/Kernels-ManyThreads-CombinedTests5-10msYield-noload.png
>> http://devloop.org.uk/documentation/database-performance/Linux-Kernels/Kernels-ManyThreads-CombinedTests5-10msYield.png
>> Compared with more kernels here - a bit more cluttered:
>> http://devloop.org.uk/documentation/database-performance/Linux-Kernels/Kernels-ManyThreads-CombinedTests4-10msYield-noload.png
>>
>> Thanks Ingo!
>> Does this mean that I'll have to keep doing:
>> echo 1 > /proc/sys/kernel/sched_yield_bug_workaround
>> Or are you planning on finding a more elegant solution?
> 
> just to make sure - can you get it to work fast with the 
> -rc6+yield-patch solution too? (i.e. not CFS-devel) We need a (tested) 
> solution for 2.6.23 and the CFS-devel patches are not for 2.6.23. I've 
> attached below the latest version of the -rc6 yield patch - the switch 
> is not dependent on SCHED_DEBUG anymore but always available.
> 

Is this going to be merged? And will you be making the default == 1 or
just leaving it at 0, which forces people who want the older behavior to
modify the default?

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