From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752777AbXCJCUo (ORCPT ); Fri, 9 Mar 2007 21:20:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752796AbXCJCUo (ORCPT ); Fri, 9 Mar 2007 21:20:44 -0500 Received: from mail20.syd.optusnet.com.au ([211.29.132.201]:37127 "EHLO mail20.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752777AbXCJCUn (ORCPT ); Fri, 9 Mar 2007 21:20:43 -0500 From: Con Kolivas To: Matt Mackall Subject: Re: 2.6.21-rc3-mm1 RSDL results Date: Sat, 10 Mar 2007 13:20:22 +1100 User-Agent: KMail/1.9.5 Cc: linux-kernel , akpm@linux-foundation.org References: <20070309053931.GA10459@waste.org> <200703101228.38923.kernel@kolivas.org> <20070310014230.GP10394@waste.org> In-Reply-To: <20070310014230.GP10394@waste.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200703101320.23125.kernel@kolivas.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 10 March 2007 12:42, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 12:28:38PM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 11:49, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 11:34:26AM +1100, Con Kolivas wrote: > > > > Ok, so some of the basics then. Can you please give me the output of > > > > 'top -b' running for a few seconds during the whole affair? > > > > > > Here you go: > > > > > > http://selenic.com/baseline > > > http://selenic.com/underload > > > > > > This is with 2.6.20+rsdl+tickfix at HZ=250. > > > > > > Something I haven't mentioned about my setup is that I'm using ccache. > > > And it turns out disabling ccache makes a large difference. Going to > > > switch back to a NO_HZ kernel and see what that looks like. > > > > Your X is reniced to -10 so.... try again with X nice 0 please. > > Doh, can't believe I didn't notice that. That's apparently a default > in Debian/unstable (not sure where to tweak it). See other email from Kyle on how to dpkg reconfigure. I submitted a bug report to debian years ago about this and I presume it was fixed but you've probably slowly dist upgraded from an older version and it stayed in your config? > Reniced: > > without ccache with ccache > make -j 5 > beryl good ok > galeon ok/good ok > mp3 good good > terminal good ok > mouse good ok Progress at last! And without any patches! Well those look very reasonable to me. Especially since -j5 is a worst case scenario. > We're still left with a big unexplained ccache differential, But would you say it's still _adequate_ with ccache considering you only have 1/6th cpu left for X? With and without ccache it's quite a different workload so they will behave differently. > and a big > NO_HZ vs HZ=250 differential. That part I don't know about. You've only tested the difference with X running nice -10. I need to look further at the mechanism for -nice tasks. It should be possible to run smoothly even with a -niced X (although that was never my intent) so perhaps that's not working properly. I'll look into that. Thanks! -- -ck