From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: "Chris Friesen" <cfriesen@nortel.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
a.p.zijlstra@chello.nl, pj@sgi.com,
Balbir Singh <balbir@in.ibm.com>,
aneesh.kumar@linux.vnet.ibm.com, dhaval@linux.vnet.ibm.com
Subject: Re: fair group scheduler not so fair?
Date: Thu, 29 May 2008 08:20:39 +0530 [thread overview]
Message-ID: <20080529025039.GA12836@linux.vnet.ibm.com> (raw)
In-Reply-To: <483DA5E7.5050600@nortel.com>
On Wed, May 28, 2008 at 12:35:19PM -0600, Chris Friesen wrote:
> Srivatsa Vaddagiri wrote:
>
>> We seem to be skipping the last element in the task list always. In your
>> case, the lone task in Group a/b is always skipped because of this.
>
>> Updated patch (on top of 2.6.26-rc3 +
>> http://programming.kicks-ass.net/kernel-patches/sched-smp-group-fixes/)
>> below. Pls let me know how it fares!
>
> Looking much better, but still some fairness issues with more complex
> setups.
>
[snip]
> A 10-sec average was better, but we still see errors of 6%:
> 2478 72.8%
> 2477 64.0%
> 2479 63.2%
Yes I have observed that the delta from ideal fairness is much more than
desirable (although I used to get much better fairness with
2.6.25-rc1. Let me verify and get back).
--
Regards,
vatsa
next prev parent reply other threads:[~2008-05-29 2:41 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-21 23:59 fair group scheduler not so fair? Chris Friesen
2008-05-22 6:56 ` Peter Zijlstra
2008-05-22 20:02 ` Chris Friesen
2008-05-22 20:07 ` Peter Zijlstra
2008-05-22 20:18 ` Li, Tong N
2008-05-22 21:13 ` Peter Zijlstra
2008-05-23 0:17 ` Chris Friesen
2008-05-23 7:44 ` Srivatsa Vaddagiri
2008-05-23 9:42 ` Srivatsa Vaddagiri
2008-05-23 9:39 ` Peter Zijlstra
2008-05-23 10:19 ` Srivatsa Vaddagiri
2008-05-23 10:16 ` Peter Zijlstra
2008-05-27 17:15 ` Srivatsa Vaddagiri
2008-05-27 18:13 ` Chris Friesen
2008-05-28 16:33 ` Srivatsa Vaddagiri
2008-05-28 18:35 ` Chris Friesen
2008-05-28 18:47 ` Dhaval Giani
2008-05-29 2:50 ` Srivatsa Vaddagiri [this message]
2008-05-29 16:46 ` Srivatsa Vaddagiri
2008-05-29 16:47 ` Srivatsa Vaddagiri
2008-05-29 21:30 ` Chris Friesen
2008-05-30 6:43 ` Dhaval Giani
2008-05-30 10:21 ` Srivatsa Vaddagiri
2008-05-30 11:36 ` Srivatsa Vaddagiri
2008-06-02 20:03 ` Chris Friesen
2008-05-27 17:28 ` Srivatsa Vaddagiri
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