linux-kernel - Re: 2.6.25-rc1: volanoMark 45% regression

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Message-ID: <47B91615.3040407@linux.vnet.ibm.com>
Date:	Mon, 18 Feb 2008 10:52:29 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	vatsa@...ux.vnet.ibm.com, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: 2.6.25-rc1: volanoMark 45% regression

Zhang, Yanmin wrote:
> On Mon, 2008-02-18 at 10:26 +0530, Balbir Singh wrote:
>> Zhang, Yanmin wrote:
>>>>>  Did you have
>>>>> CONFIG_FAIR_USER_SCHED enabled in both cases?
>>>> Yes.
>>>>
>>>> CONFIG_FAIR_GROUP_SCHED=y
>>>> CONFIG_FAIR_USER_SCHED=y
>>>>
>> Interesting that you have CONFIG_FAIR_USER_SCHED. Do you have any other users on
>> the system (are they running anything at the time of the benchmark)?
> No. As for volanoMark, I start volanoMark both server and client processes while
> starting some system measurement tools such like vmstat/iostat/sar. All the processes
> run under the same user.
> 

Ok, so the bandwidth is not split between users, which is very good. I assume
the same user is root?

> 
>>  Could you
>> turn off CONFIG_FAIR_USER_SCHED  and turn on CONFIG_FAIR_GROUP_SCHED.
> I will try.
> 
>>  I am going
>> to run some tests with 2.6.25-rc2 and Volanomark and see how that goes.
> Pls. set /proc/sys/kernel/sched_compat_yield=1 before starting test.

Thanks for the tip, I would have definitely missed this one

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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