From: Ken Chen <kenchen@google.com>
To: Chris Friesen <cfriesen@nortel.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: busted CFS group load balancer?
Date: Mon, 17 Nov 2008 23:52:50 -0800 [thread overview]
Message-ID: <b040c32a0811172352n537ef2e1h9628a97fbb838292@mail.gmail.com> (raw)
In-Reply-To: <b040c32a0811171204p4ce6d706j3ee2c018d0f33548@mail.gmail.com>
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
prev parent reply other threads:[~2008-11-18 7:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-15 1:14 Ken Chen
2008-11-17 15:37 ` Chris Friesen
2008-11-17 20:04 ` Ken Chen
2008-11-17 21:19 ` Chris Friesen
2008-11-18 5:19 ` Peter Zijlstra
2008-11-18 7:33 ` Ken Chen
2008-11-18 12:30 ` Peter Zijlstra
2008-11-18 13:48 ` Peter Zijlstra
2008-11-18 17:27 ` Ken Chen
2008-11-18 7:52 ` Ken Chen [this message]
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