linux-kernel - Re: CFS review

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Message-ID: <20070810054948.GA5908@elte.hu>
Date:	Fri, 10 Aug 2007 07:49:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Mike Galbraith <efault@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: CFS review


* Roman Zippel <zippel@...ux-m68k.org> wrote:

> >  4544 roman     20   0  1796  520  432 S 32.1  0.4   0:21.08 lt
> >  4545 roman     20   0  1796  344  256 R 32.1  0.3   0:21.07 lt
> >  4546 roman     20   0  1796  344  256 R 31.7  0.3   0:21.07 lt
> >  4547 roman     20   0  1532  272  216 R  3.3  0.2   0:01.94 l
> > 
> > and i'm still wondering how that output was possible.
> 
> I disabled the jiffies logic and the result is still the same, so this 
> problem isn't related to resolution at all.

how did you disable the jiffies logic? Also, could you please send me 
the cfs-debug-info.sh:

  http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh

captured _while_ the above workload is running. This is the third time 
i've asked for that :-)

to establish that the basic sched_clock() behavior is sound on that box, 
could you please also run this tool:

   http://people.redhat.com/mingo/cfs-scheduler/tools/tsc-dump.c

please run it both while the system is idle, and while there's a CPU hog 
running:

  while :; do :; done &

and send me that output too? (it's 2x 60 lines only) Thanks!

	Ingo
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