linux-kernel - Re: [git] CFS-devel, group scheduler, fixes

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Date:	Sat, 22 Sep 2007 12:01:48 +0200
From:	Mike Galbraith <efault@....de>
To:	Tong Li <tong.n.li@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, dimm <dmitry.adamushko@...il.com>,
	linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [git] CFS-devel, group scheduler, fixes

On Fri, 2007-09-21 at 20:27 -0700, Tong Li wrote:
> Mike,
> 
> Could you try this patch to see if it solves the latency problem?

No, but it helps some when running two un-pinned busy loops, one at nice
0, and the other at nice 19.  Yesterday I hit latencies of up to 1.2
_seconds_ doing this, and logging sched_debug and /proc/`pidof
Xorg`/sched from SCHED_RR shells.

se.wait_max              :           164.242748
se.wait_max              :           121.996128
se.wait_max              :           194.464773
se.wait_max              :           517.425411
se.wait_max              :           131.453214
se.wait_max              :           122.984190
se.wait_max              :           111.729274
se.wait_max              :           119.567580
se.wait_max              :           126.980696
se.wait_max              :           177.241452
se.wait_max              :           129.604329
se.wait_max              :           119.631657

It doesn't help at all with this oddity while running same:

root@...er: now is
the time
foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooor aall good men to come to the aid of their country

That was a nice 0 shell window.  I'm not a great typist, but I ain't
_that_ bad :)

	-Mike

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