From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267475AbUHECxp (ORCPT ); Wed, 4 Aug 2004 22:53:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267474AbUHECxp (ORCPT ); Wed, 4 Aug 2004 22:53:45 -0400 Received: from mail019.syd.optusnet.com.au ([211.29.132.73]:17100 "EHLO mail019.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S267308AbUHECxl (ORCPT ); Wed, 4 Aug 2004 22:53:41 -0400 References: <20040802015527.49088944.akpm@osdl.org> <410E3CAF.6080305@kolivas.org> <410F3423.3020409@yahoo.com.au> <41109FCC.4070906@yahoo.com.au> <20040804103143.GA13072@elte.hu> <20040804124538.GA15505@elte.hu> Message-ID: X-Mailer: http://www.courier-mta.org/cone/ From: Con Kolivas To: Ingo Molnar Cc: Nick Piggin , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: 2.6.8-rc2-mm2 Date: Thu, 05 Aug 2004 12:53:00 +1000 Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset="US-ASCII" Content-Disposition: inline Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Ingo Molnar writes: > > * Con Kolivas wrote: > >> Ingo Molnar writes: >> >> Thanks for replying. >> >> >* Nick Piggin wrote: >> > >> >>Also, basic interactivity in X is bad with the interactive sysctl set >> >>to 0 (is X supposed to be at nice 0?), however fairness is bad when >> >>interactive is 1. I'm not sure if this is an acceptable tradeoff - are >> >>you planning to fix it? >> > >> >it also has clear interactivity problems when just running lots of CPU >> >hogs even with the default interactive=1 compute=0 setting. >> >> Can you define them please? I haven't had any reported to me. > > sure: take a process that uses 85% of CPU time (and sleeps 15% of the > time) if running on an idle system. Start just two of these hogs at > normal priority. 2.6.8-rc2-mm2 becomes almost instantly unusable even > over a text console: a single 'top' refresh takes ages, 'ls' displays > one line per second or so. Start more of these and the system > effectively locks up. It's only if I physically try and create such a test application that I can reproduce it. I haven't found any real world load that does that - but of course that doesn't mean I should discount it. However, interactive mode off doesn't exhibit it and it should be easy enough to fix for interactive mode on. Thanks for pointing it out. Cheers, Con