From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267325AbUHEMt0 (ORCPT ); Thu, 5 Aug 2004 08:49:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266692AbUHEMry (ORCPT ); Thu, 5 Aug 2004 08:47:54 -0400 Received: from mx1.elte.hu ([157.181.1.137]:11954 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S266749AbUHEMrJ (ORCPT ); Thu, 5 Aug 2004 08:47:09 -0400 Date: Thu, 5 Aug 2004 12:47:17 +0200 From: Ingo Molnar To: Con Kolivas Cc: Nick Piggin , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: 2.6.8-rc2-mm2 Message-ID: <20040805104717.GA20517@elte.hu> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Con Kolivas wrote: > >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. cool. Will be curious how it will look like once staircase-sched gets its time-shared slot in -mm next time around :-) But in general i'm quite positive about the staircase scheduler. Ingo