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From: Lukas Hejtmanek <xhejtman@ics.muni.cz>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>,
	mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: 2.6.24-git4+ regression
Date: Mon, 4 Feb 2008 18:00:49 +0100	[thread overview]
Message-ID: <20080204170049.GA4207@ics.muni.cz> (raw)
In-Reply-To: <1202136310.6890.0.camel@lappy>

On Mon, Feb 04, 2008 at 03:45:10PM +0100, Peter Zijlstra wrote:
> > see my previous mail to Ingo (you were Cc.), latency top says that Xorg and
> > gnome-terminal suffers 300+ms latency in scheduler: waiting for cpu.
> 
> what happens when you turn CONFIG_FAIR_GROUP_SCHED off?

If I disable CONFIG_FAIR_GROUP_SCHED, it is a lot better. I would not call it
optimal, though. 

Xorg has 20ms latency, gnome-terminal another 20ms latency. If I just press
a key (a letter for instance) to see how autorepeat fills terminal, one can
see that autorepeat is not smooth and it is stopping for a little while
(really extra short stops are visible but still visible). But  it is really 
a ton better that it was with fair group sched.

So, any conclusion? The case is closed or any further investigation should be 
done?

-- 
Lukáš Hejtmánek

  reply	other threads:[~2008-02-04 17:01 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-30 13:56 Lukas Hejtmanek
2008-01-31 10:29 ` Ingo Molnar
2008-01-31 10:55   ` Lukas Hejtmanek
2008-02-04 11:17   ` Lukas Hejtmanek
2008-02-04 11:36     ` Peter Zijlstra
2008-02-04 14:36       ` Lukas Hejtmanek
2008-02-04 14:45         ` Peter Zijlstra
2008-02-04 17:00           ` Lukas Hejtmanek [this message]
2008-02-04 12:01     ` Ingo Molnar
2008-02-04 12:29       ` Lukas Hejtmanek
2008-02-04 13:04         ` Ingo Molnar
2008-02-04 13:49           ` Lukas Hejtmanek
2008-02-14 16:55 ` Srivatsa Vaddagiri
2008-02-17 20:26   ` Lukas Hejtmanek
2008-02-18  4:28     ` Ingo Molnar
2008-02-18  7:38       ` Mike Galbraith
2008-02-18  8:20         ` Srivatsa Vaddagiri
2008-02-18  8:36           ` Mike Galbraith
     [not found]             ` <1203325554.4889.2.camel@homer.simson.net>
     [not found]               ` <1203345102.5984.1.camel@homer.simson.net>
2008-02-19  8:15                 ` Mike Galbraith

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