Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933839AbaD2LWb (ORCPT ); Tue, 29 Apr 2014 07:22:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32414 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756966AbaD2LTp (ORCPT ); Tue, 29 Apr 2014 07:19:45 -0400 Message-ID: <535F8ACF.1040506@redhat.com> Date: Tue, 29 Apr 2014 07:19:43 -0400 From: Prarit Bhargava User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131028 Thunderbird/17.0.10 MIME-Version: 1.0 To: John Stultz CC: LKML , Miroslav Lichvar , Richard Cochran Subject: Re: [PATCH 0/3] timekeeping: Improved NOHZ frequency steering References: <1398380677-8684-1-git-send-email-john.stultz@linaro.org> In-Reply-To: <1398380677-8684-1-git-send-email-john.stultz@linaro.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 P. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/