linux-kernel - Re: [PATCH 0/3] timekeeping: Improved NOHZ frequency steering

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Message-ID: <535AB0B5.8060305@redhat.com>
Date:	Fri, 25 Apr 2014 15:00:05 -0400
From:	Prarit Bhargava <prarit@...hat.com>
To:	John Stultz <john.stultz@...aro.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Miroslav Lichvar <mlichvar@...hat.com>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH 0/3] timekeeping: Improved NOHZ frequency steering



On 04/24/2014 07:04 PM, John Stultz wrote:
> Continuing the sporadic work on improving the timekeeping
> frequency steering logic when NOHZ is enabled, I've made a number
> of changes to my re-implementation of Miroslav's patch (most
> recently posted here: https://lkml.org/lkml/2014/2/12/401 ),
> and I'm getting much closer results in the simulator.
> 
> Compared with Miroslav's patch, this avoids doing any extra
> divisions, and instead approximates the correction
> logarithmically. In addition to trying to lower overhead, this
> allows the other accounting bits to be managed in much the
> same way we have been doing for awhile.
> 
> This patch set contains one portion from Miroslav's patch
> (ntp_tick caching) split out into a separate logical patch.
> 
> Below are some of the simulator results (BTW Miroslav, w/ 3.15-rc,
> you'll need to revert b399fe355b30d01 to get the simulator building)
> comparing this patchset to Miroslav's patch to show we're getting in
> the right order of magnitude.
> 

John, I'm going to put this into a weekend long test right away (along with
another unrelated cpupower patch).  I'll ping back Monday to let you know how it
went.

P.
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