Re: 2.6.25-rc1: volanoMark 45% regression

[Balbir Singh <balbir@linux.vnet.ibm.com>]

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