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

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Date:	Mon, 12 May 2008 10:22:46 +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 11:33:20AM +0800, Zhang, Yanmin wrote:
> 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).

This for confirming my observation. It seems much better than the 50% regression
reported earlier (with 2.6.26-rc1 and CONFIG_USER_SCHED).

Ideally we should get same results with CONFIG_USER_SCHED also (in
2.6.26-rc1). That needs some work in load balance code. Till that is
tackled, IMHO we can retain all the current code by either:

1. Disabling CONFIG_GROUP_SCHED (or better)
2. Enable CONFIG_GROUP_SCHED and CONFIG_CGROUP_SCHED

Ingo/Peter, What's your opinion?

-- 
Regards,
vatsa
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