From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1767629AbXCIXSo (ORCPT ); Fri, 9 Mar 2007 18:18:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1767635AbXCIXSo (ORCPT ); Fri, 9 Mar 2007 18:18:44 -0500 Received: from waste.org ([66.93.16.53]:54822 "EHLO waste.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1767629AbXCIXSn (ORCPT ); Fri, 9 Mar 2007 18:18:43 -0500 Date: Fri, 9 Mar 2007 17:06:13 -0600 From: Matt Mackall To: Con Kolivas Cc: linux-kernel , akpm@linux-foundation.org Subject: Re: 2.6.21-rc3-mm1 RSDL results Message-ID: <20070309230612.GL10394@waste.org> References: <20070309053931.GA10459@waste.org> <200703100918.05547.kernel@kolivas.org> <20070309222923.GK10394@waste.org> <200703101002.37920.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200703101002.37920.kernel@kolivas.org> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 10, 2007 at 10:02:37AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 09:29, Matt Mackall wrote: > > On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > > > So what's different between makes in parallel and make -j 5? Make's > > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > > > Hmm it must be those deep pipes again then. I removed any quirks > > > > testing for those from mainline as I suspected it would be ok. Guess > > > > I"m wrong. > > > > > > I shouldn't blame this straight up though if NO_HZ makes it better. > > > Something else is going wrong... wtf though? > > > > Just so we're clear, dynticks has only 'fixed' the single non-parallel > > make load so far. > > Ok, back to the pipe idea. Without needing a kernel recompile, can you try > running the make -j5 as a SCHED_BATCH task? Seems the same. Oddly, nice make -j 5 is better than batch (but not quite up to stock). -- Mathematics is the supreme nostalgia of our time.