linux-kernel - Re: 2.6.24-git4+ regression

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Message-ID: <20080131105504.GA4332@ics.muni.cz>
Date:	Thu, 31 Jan 2008 11:55:05 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: 2.6.24-git4+ regression

On Thu, Jan 31, 2008 at 11:29:19AM +0100, Ingo Molnar wrote:
> if you apply the current sched-fixes (rollup patch below), does it get 
> any better?

No. 

Another observation, running two instances of while true; do true; done (on
1 dual core cpu) does not break interactivity.

running make clean; make -j2 in kernel tree breaks interactivity terribly.
Looks like disk I/O activity is needed to break interactivity. 

While compiling, I have more than 1GB of RAM free. One friend of mine suggests
that kernel is swapping out binaries which causes non-interactivity. The
swaparea is clean, though. He also reports that the behavior can be seen even
in 2.6.24-rc8. 

-- 
Lukáš Hejtmánek
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