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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 29 Apr 2014 07:19:43 -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.
> 
> 

Tested-by: Prarit Bhargava <prarit@...hat.com>

P.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/