linux-kernel - Re: busted CFS group load balancer?

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Message-ID: <b040c32a0811172352n537ef2e1h9628a97fbb838292@mail.gmail.com>
Date:	Mon, 17 Nov 2008 23:52:50 -0800
From:	Ken Chen <kenchen@...gle.com>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: busted CFS group load balancer?

On Mon, Nov 17, 2008 at 7:37 AM, Chris Friesen wrote:
>> It appears that the fair-group load balancer in 2.6.27 does not work
>> properly.
>
> There was an issue fixed post 2.6.27 where the load balancer didn't work
> properly if there was one task per group per cpu.  You might try
> backporting commit 38736f4 and see if that helps.

On Mon, Nov 17, 2008 at 12:04 PM, Ken Chen wrote:
> Tested git commit 38736f4, it doesn't fix the problem I'm seeing.

I would also like to mention that commit 38736f4 has stability
problems.  I put a kernel with this commit on several test machines,
and several of them had hard lockups within 2 hours of testing.  I
wasn't doing anything fancy.  The workload was pure 'while (1)' loop.
Though there are other background services running on those machines.

- Ken
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