From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752145AbXCMTvl (ORCPT ); Tue, 13 Mar 2007 15:51:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752625AbXCMTvl (ORCPT ); Tue, 13 Mar 2007 15:51:41 -0400 Received: from [212.12.190.65] ([212.12.190.65]:33045 "EHLO raad.intranet" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752145AbXCMTvk (ORCPT ); Tue, 13 Mar 2007 15:51:40 -0400 From: Al Boldi To: linux-kernel@vger.kernel.org Subject: Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with differential nice -1 Date: Tue, 13 Mar 2007 22:54:28 +0300 User-Agent: KMail/1.5 Cc: ck@vds.kolivas.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200703132254.28281.a1426z@gawab.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con Kolivas wrote: > On Wednesday 14 March 2007 03:03, Con Kolivas wrote: > > On Wednesday 14 March 2007 02:31, Con Kolivas wrote: > > > On Monday 12 March 2007 22:26, Al Boldi wrote: > > > > I think, it should be possible to spread this max expiration latency > > > > across the rotation, should it not? > > > > > > Can you try the attached patch please Al and Mike? It "dithers" the > > > priority bitmap which tends to fluctuate the latency a lot more but in > > > a cyclical fashion. This tends to make the max latency bound to a > > > smaller value and should make it possible to run -nice tasks without > > > killing the latency of the non niced tasks. Eg you could possibly run > > > X nice -10 at a guess like we used to in 2.4 days. It's not essential > > > of course, but is a workaround for Mike's testcase. > > > > Oops, one tiny fix. This is a respin of the patch, sorry. > > A few other minor things would need to be updated before this patch is in > a good enough shape to join the rsdl patches. This one will be good for > testing though. Applied against v0.30 mainline. It only works on prio +16 to +19. Thanks! -- Al