linux-kernel - Re: Inconsistent load average on tickless kernels

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Date:	Mon, 23 Apr 2012 12:57:15 -0500
From:	Jonathan Nieder <jrnieder@...il.com>
To:	Lesław Kopeć <leslaw.kopec@...za-klasa.pl>
Cc:	Peter Zijlstra <peterz@...radead.org>, Aman Gupta <aman@...1.net>,
	linux-kernel@...r.kernel.org,
	Chase Douglas <chase.douglas@...onical.com>,
	Damien Wyart <damien.wyart@...e.fr>,
	Kyle McMartin <kyle@...hat.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Doug Smythies <dsmythies@...us.net>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Inconsistent load average on tickless kernels

Lesław Kopeć wrote:

> 2.6.32.55-hz-0f004f5a69			9.88
> 2.6.32.55-no-hz-74f5187ac8		2.48
> 2.6.32.55-no-hz-c308b56b53		2.22
> 3.0.28-hz				10.66
> 3.0.28-no-hz				0.60
> 3.0.28-no-hz-c308b56b53			4.09
> 3.0.28-no-hz-c308b56b53 nohz=off	6.78
> 3.2.12-hz				10.16
> 3.2.12-no-hz				0.66
> 3.2.12-no-hz-c308b56b53			4.36
>
> What's worth noting is that I haven't seen any nasty side effects of the
> latest patch on all kernel versions that I've tested. Hope that helps.

Ok.

Peter, do you think it would make sense to add c308b56b53987 to 3.0.y
and newer stable kernels?

Thanks,
Jonathan
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