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Subject: Re: volanoMark regression with kernel 2.6.26-rc1
From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: vatsa@linux.vnet.ibm.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>
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Date: Mon, 12 May 2008 11:33:20 +0800
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On Mon, 2008-05-12 at 08:07 +0530, Srivatsa Vaddagiri wrote:
> 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).
I tested it with below config against 2.6.26-rc1.

CONFIG_CGROUPS=y
# CONFIG_CGROUP_DEBUG is not set
# CONFIG_CGROUP_NS is not set
# CONFIG_CGROUP_DEVICE is not set
# CONFIG_CPUSETS is not set
CONFIG_GROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
# CONFIG_RT_GROUP_SCHED is not set
# CONFIG_USER_SCHED is not set
CONFIG_CGROUP_SCHED=y
# CONFIG_CGROUP_CPUACCT is not set
# CONFIG_RESOURCE_COUNTERS is not set


To make the testing faster, I changed some parameters of volanoMark.
The result of 2.6.26-rc1(CONFIG_CGROUP_SCHED=y) is about 2%~3% less than the one of
2.6.25 (CONFIG_USER_SCHED=y).

-yanmin