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From: Miao Xie <miaox@cn.fujitsu.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>, Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] sched: fair group's bug
Date: Mon, 23 Feb 2009 19:09:06 +0800	[thread overview]
Message-ID: <49A283D2.8060300@cn.fujitsu.com> (raw)
In-Reply-To: <1231424195.11687.449.camel@twins>

on 2009-1-8 22:16 Peter Zijlstra wrote:
> On Thu, 2009-01-08 at 09:30 +0800, Miao Xie wrote:
>> I tested fair group scheduler on my hyper-threading x86_64 box(2 CPU * 2 HT)
>> and found the deviation of the groups' CPU usage was larger than 2.6.26
>> when *offline* a CPU or do hotplug frequently. It is less than 1% On 2.6.26，but
>> On current kernel, it is often greater than 4%, even than 10% by accident.
> 
> Its not a bug -- a scheduler without smp awareness cannot be compared to
> one without -- .26 just wasn't a complete group scheduler.
> 
> At best its a regression for your particular workload.
> 

Hi, Peter
Do you wait to fix this regression?

Thanks!
Miao


  reply	other threads:[~2009-02-23 11:12 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-08  1:30 [BUG] sched: fair group's bug Miao Xie
2009-01-08  3:35 ` Miao Xie
2009-01-08 14:16 ` Peter Zijlstra
2009-02-23 11:09   ` Miao Xie [this message]
2009-01-09  2:45 ` Miao Xie

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