linux-kernel - Re: CFS review

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Message-ID: <20070801190556.GA1199@elte.hu>
Date:	Wed, 1 Aug 2007 21:05:56 +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:

> Hi,
> 
> On Wed, 1 Aug 2007, Ingo Molnar wrote:
> 
> > Andi's theory cannot be true either, Roman's debug info also shows this 
> > /proc/<PID>/sched data:
> > 
> >   clock-delta              :                  95
> > 
> > that means that sched_clock() is in high-res mode, the TSC is alive and 
> > kicking and a sched_clock() call took 95 nanoseconds.
> > 
> > Roman, could you please help us with this mystery?
> 
> Actually, Andi is right. What I sent you was generated directly after 
> boot, as I had to reboot for the right kernel, so a little later 
> appeared this:
> 
> Aug  1 14:54:30 spit kernel: eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
> Aug  1 15:09:56 spit kernel: Clocksource tsc unstable (delta = 656747233 ns)
> Aug  1 15:09:56 spit kernel: Time: pit clocksource has been installed.

just to make sure, how does 'top' output of the l + "lt 3" testcase look 
like now on your laptop? Yesterday it was this:

 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.

	Ingo
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