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Date: Mon, 12 May 2008 08:07:58 +0530
From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Aneesh Kumar KV <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: volanoMark regression with kernel 2.6.26-rc1
Message-ID: <20080512023758.GN3612@linux.vnet.ibm.com>
Reply-To: vatsa@linux.vnet.ibm.com
References: <1210039590.3453.18.camel@ymzhang> <20080506115207.GA24862@linux.vnet.ibm.com> <20080507173357.GA4424@linux.vnet.ibm.com> <1210223914.3453.102.camel@ymzhang> <20080508054047.GD32729@linux.vnet.ibm.com> <1210226013.3453.113.camel@ymzhang> <20080508061125.GC3644@linux.vnet.ibm.com> <20080509155240.GH3612@linux.vnet.ibm.com> <1210556351.3151.2.camel@ymzhang>
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On Mon, May 12, 2008 at 09:39:10AM +0800, Zhang, Yanmin wrote:
> I'm confused by these conceptions.

Sorry if the recommended options was not clear.

> Would you like to tell me the exact config options
> you want to turn on?
> 
> Options in my config file(both 2.6.25 and 2.6.26-rc1):
> 
> # CONFIG_CGROUPS is not set
> CONFIG_GROUP_SCHED=y
> CONFIG_FAIR_GROUP_SCHED=y
> # CONFIG_RT_GROUP_SCHED is not set
> CONFIG_USER_SCHED=y
> # CONFIG_CGROUP_SCHED is not set

Retain this config for 2.6.25.

For 2.6.26-rc1, turn OFF CONFIG_USER_SCHED and turn ON CONFIG_CGROUP_SCHED i.e

# CONFIG_USER_SCHED is not set
CONFIG_CGROUP_SCHED=y

[Note that above options are mutually exclusive i.e you cannot set both
of them to y]

>>From my experiments, results of 2.6.25 (with CONFIG_USER_SCHED=y) are
same as 2.6.26-rc1 (with CONFIG_CGROUP_SCHED=y).

It'd be great if you could confirm the same in your environment.

-- 
Regards,
vatsa