linux-kernel - Re: volanoMark regression with kernel 2.6.26-rc1

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Message-ID: <20080512023758.GN3612@linux.vnet.ibm.com>
Date:	Mon, 12 May 2008 08:07:58 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Aneesh Kumar KV <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: volanoMark regression with kernel 2.6.26-rc1

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
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