From: Ingo Molnar <mingo@elte.hu>
To: Chris Friesen <cfriesen@nortel.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Dmitry Adamushko <dmitry.adamushko@gmail.com>,
Peter Williams <pwil3058@bigpond.net.au>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] CFS scheduler, -v12
Date: Tue, 22 May 2007 22:15:18 +0200 [thread overview]
Message-ID: <20070522201518.GC6113@elte.hu> (raw)
In-Reply-To: <46531EF6.3020204@nortel.com>
* Chris Friesen <cfriesen@nortel.com> wrote:
> Ingo Molnar wrote:
>
> >CFS is fair even on SMP. Consider for example the worst-case
> >3-tasks-on-2-CPUs workload on a 2-CPU box:
> >
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 2658 mingo 20 0 1580 248 200 R 67 0.0 0:56.30 loop
> > 2656 mingo 20 0 1580 252 200 R 66 0.0 0:55.55 loop
> > 2657 mingo 20 0 1576 248 200 R 66 0.0 0:55.24 loop
> >
> >66% of CPU time for each task. The 'TIME+' column shows a 2% spread
> >between the slowest and the fastest loop after just 1 minute of runtime
> >(and the spread gets narrower with time).
>
> Is there a way in CFS to tune the amount of time over which the load
> balancer is fair? (Of course there would be some overhead involved.)
it should be fair pretty fast (see the 10 seconds run of massive_intr) -
so it's not 1 minute (if you were worried about that).
Ingo
next prev parent reply other threads:[~2007-05-22 20:15 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-13 15:38 [patch] CFS scheduler, -v12 Ingo Molnar
2007-05-16 2:04 ` Peter Williams
2007-05-16 8:08 ` Ingo Molnar
2007-05-16 23:42 ` Peter Williams
[not found] ` <20070516063625.GA9058@elte.hu>
2007-05-17 23:45 ` Peter Williams
[not found] ` <20070518071325.GB28702@elte.hu>
2007-05-18 13:11 ` Peter Williams
2007-05-18 13:26 ` Peter Williams
2007-05-19 13:27 ` Dmitry Adamushko
2007-05-20 1:41 ` Peter Williams
2007-05-21 8:29 ` William Lee Irwin III
2007-05-21 8:57 ` Ingo Molnar
2007-05-21 12:08 ` William Lee Irwin III
2007-05-22 16:48 ` Chris Friesen
2007-05-22 20:15 ` Ingo Molnar [this message]
2007-05-22 20:49 ` Chris Friesen
2007-05-21 15:25 ` Dmitry Adamushko
2007-05-21 23:51 ` Peter Williams
2007-05-22 4:47 ` Peter Williams
2007-05-22 12:03 ` Peter Williams
2007-05-24 7:43 ` Peter Williams
2007-05-24 16:45 ` Siddha, Suresh B
2007-05-24 23:23 ` Peter Williams
2007-05-29 20:45 ` Siddha, Suresh B
2007-05-29 23:54 ` Peter Williams
2007-05-30 0:50 ` Siddha, Suresh B
2007-05-30 2:18 ` Peter Williams
2007-05-30 4:42 ` Siddha, Suresh B
2007-05-30 6:28 ` Peter Williams
2007-05-31 1:49 ` Peter Williams
2007-05-22 11:52 ` Dmitry Adamushko
2007-05-23 0:10 ` Peter Williams
2007-05-18 0:18 ` Bill Huey
2007-05-18 1:01 ` Bill Huey
2007-05-18 4:13 ` William Lee Irwin III
2007-05-18 7:31 ` Ingo Molnar
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