linux-kernel - Re: CFS review

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Message-ID: <Pine.LNX.4.64.0708011955430.1817@scrub.home>
Date:	Wed, 1 Aug 2007 20:01:21 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Ingo Molnar <mingo@...e.hu>
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

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.

bye, Roman
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