From: Al Boldi <a1426z@gawab.com>
To: linux-kernel@vger.kernel.org
Subject: Re: SD scheduler testing hitch
Date: Sun, 8 Apr 2007 21:34:43 +0300 [thread overview]
Message-ID: <200704082134.43029.a1426z@gawab.com> (raw)
Mike Galbraith wrote:
> On Sat, 2007-04-07 at 19:17 +0200, Mike Galbraith wrote:
> > I lowered the time to 500us, and ran at nice -10.. it starves tenpercent
> > here every time. (ran as taskset -c 1 nice -n -10 ./fairtest) The
> > starving 10% duty cycle task has trouble getting 1% CPU.
>
> Hmm. Playing with it some more today, it still happens, but it's not
> very repeatable. Something is odd. I wonder if any SD using readers
> will try it.
Tried it on mainline 2.6.20.3.
It's not easily repeatable, but it's got the same problem.
top - 21:21:45 up 27 min, 0 users, load average: 0.80, 0.43, 0.20
Tasks: 45 total, 3 running, 42 sleeping, 0 stopped, 0 zombie
Cpu(s): 24.3% user, 0.5% system, 0.0% nice, 75.0% idle, 0.2% IO-wait
Mem: 499488k total, 27352k used, 472136k free, 1996k buffers
Swap: 1020088k total, 0k used, 1020088k free, 9160k cached
PID PR NI VIRT RES SHR SWAP nFLT nDRT WCHAN S %CPU TIME+ Command
688 25 0 1804 412 352 1392 0 0 rest_init R 94.7 2:37.01 fairtest
689 15 0 1804 264 204 1540 0 0 rest_init R 0.0 0:00.79 fairtest
1 15 0 1440 500 444 940 15 0 rest_init S 0.0 0:00.73 init
Thanks!
--
Al
next reply other threads:[~2007-04-08 18:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-08 18:34 Al Boldi [this message]
2007-04-09 6:23 ` Mike Galbraith
2007-04-09 9:20 ` Dmitry Adamushko
2007-04-09 9:57 ` Mike Galbraith
-- strict thread matches above, loose matches on Subject: below --
2007-04-04 14:04 [sched] redundant reschedule when set_user_nice() boosts a prio of a task from the "expired" array Dmitry Adamushko
2007-04-04 14:15 ` Ingo Molnar
2007-04-04 20:05 ` [PATCH] " Dmitry Adamushko
2007-04-07 0:03 ` Andrew Morton
2007-04-07 9:24 ` Ingo Molnar
2007-04-07 16:20 ` SD scheduler testing hitch Mike Galbraith
2007-04-07 17:17 ` Mike Galbraith
2007-04-08 8:02 ` Mike Galbraith
2007-04-09 0:14 ` Dmitry Adamushko
2007-04-09 0:23 ` Dmitry Adamushko
2007-04-09 5:54 ` Mike Galbraith
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