linux-kernel - Re: printk timestamps jumping back and forth in 2.6.25-rc.

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Message-ID: <20080229194547.GC21249@elte.hu>
Date:	Fri, 29 Feb 2008 20:45:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alexey Zaytsev <alexey.zaytsev@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: printk timestamps jumping back and forth in 2.6.25-rc.


* Alexey Zaytsev <alexey.zaytsev@...il.com> wrote:

> On Thu, Feb 28, 2008 at 11:16 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> >  * Ingo Molnar <mingo@...e.hu> wrote:
> >
> >  > > Anything else I can do?
> >  >
> >  > yes, please test the patch below - does it fix the problem?
> 
> The patch worked well, thanks
> 
> I still observe some uneven mouse behaviour during compilations (linux 
> kernel, make -j 6), like, when I slowly move the mouse, it would stop 
> for a split of a second every few seconds (the intervals are not 
> equal). On 2.6.23/24 it works very smooth. Of course, I can't say that 
> the scheduler is to be blamed. It was only my assumption because I 
> thought I might be confused by the non-monotinic time, which I see is 
> not the case. Any ideas, how to debug this?

could you try latencytop, what does it say, what type of scheduler (and 
other) delays are there?

	Ingo
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