linux-kernel - Re: BFS vs. mainline scheduler benchmarks and measurements

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Message-ID: <4AAB63F8.1060301@arcor.de>
Date:	Sat, 12 Sep 2009 12:03:52 +0300
From:	Nikos Chantziaras <realnc@...or.de>
To:	Volker Armin Hemmann <volkerarmin@...glemail.com>
CC:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Con Kolivas <kernel@...ivas.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

On 09/12/2009 11:27 AM, Volker Armin Hemmann wrote:
> Hi,
>
> On Samstag 12 September 2009, Nikos Chantziaras wrote:
>>
>> On 09/11/2009 09:33 PM, Volker Armin Hemmann wrote:
>>>
>>> this is with 2.6.31+reiser4+fglrx
>>> Phenom II X4 955
>>>
>>> KDE 4.3.1, composite temporary disabled.
>>> tvtime running.
>>>
>>> load:
>>> fat emerge with make -j5 running in one konsole tab (xulrunner being
>>> compiled).
>>>
>>> without NO_NEW_FAIR_SLEEPERS:
>>>
>>> tvtime is smooth most of the time
>>>
>>> with NO_NEW_FAIR_SLEEPERS:
>>>
>>> tvtime is more jerky. Very visible in scenes with movement.
>>
>> Is the make -j5 running niced 0?
>
> yes. It always is.
>
>> If yes, that would be actually the
>> correct behavior.
>
> maybe. But I do not complain about jerks at all. I have
>
> [ 3618.305918] hpet1: lost 1 rtc interrupts
>
> with tvtime running since I switched cpus - so something is wrong anyway.

Seeing the "lost 1 rtc interrupts" message makes me wonder if this could 
possibly relate to problems with the C1E state on AMD systems (missing 
timer interrupts):

   http://lkml.org/lkml/2008/6/12/127

That thread is one year old though and your Phenom II CPU was released 7 
months later.
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