From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268342AbUHLCFc (ORCPT ); Wed, 11 Aug 2004 22:05:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268349AbUHLCFb (ORCPT ); Wed, 11 Aug 2004 22:05:31 -0400 Received: from web13903.mail.yahoo.com ([216.136.175.29]:2331 "HELO web13903.mail.yahoo.com") by vger.kernel.org with SMTP id S268342AbUHLCFJ (ORCPT ); Wed, 11 Aug 2004 22:05:09 -0400 Message-ID: <20040812020459.8528.qmail@web13903.mail.yahoo.com> Date: Wed, 11 Aug 2004 19:04:59 -0700 (PDT) From: Reply-To: spaminos-ker@yahoo.com Subject: Re: Scheduler fairness problem on 2.6 series (Attn: Nick Piggin and others) To: Con Kolivas Cc: linux-kernel@vger.kernel.org, William Lee Irwin III In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --- Con Kolivas wrote: > Hi > > I tried this on the latest staircase patch (7.I) and am not getting any > output from your script when tested up to 60 threads on my hardware. Can you > try this version of staircase please? > > There are 7.I patches against 2.6.8-rc4 and 2.6.8-rc4-mm1 > > http://ck.kolivas.org/patches/2.6/2.6.8/ > > Cheers, > Con > Just tried on my machine: 2.6.8-rc4 fails all tests (did the test just to be sure) 2.6.8-rc4 with the "from_2.6.8-rc4_to_staircase7.I" patch and things look pretty good: on my hardware, I could put 60 threads too, and my shells are still very responsive etc, and I get no slow downs with my watchdog script. A few strange things happened though (with 60 threads): * after a few minutes, I got one message Wed Aug 11 18:06:11 PDT 2004 >>>>>>> delta = 57 57 seconds !?! very surprising * shortly after that, I tried to run top, or ps, and they all got stuck, I waited a couple minutes and they were still stuck. I opened a few shells, I could do anything but commands that enumerate the process list. After a while, I killed the cputest program (ctrld c it), and the stucked ps/top continued their execution. I could not reproduce those problems ; I even rebooted the machine, but only got one message delta of 3 every 30 minutes or so. Nicolas