From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932527AbVL1LAH (ORCPT ); Wed, 28 Dec 2005 06:00:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932528AbVL1LAH (ORCPT ); Wed, 28 Dec 2005 06:00:07 -0500 Received: from 213-140-2-73.ip.fastwebnet.it ([213.140.2.73]:37296 "EHLO aa006msg.fastwebnet.it") by vger.kernel.org with ESMTP id S932527AbVL1LAG (ORCPT ); Wed, 28 Dec 2005 06:00:06 -0500 Date: Wed, 28 Dec 2005 12:01:29 +0100 From: Paolo Ornati To: Con Kolivas Cc: Linux Kernel Mailing List , Ingo Molnar Subject: Re: [SCHED] Totally WRONG prority calculation with specific test-case (since 2.6.10-bk12) Message-ID: <20051228120129.2a8d1199@localhost> In-Reply-To: <200512281027.00252.kernel@kolivas.org> References: <20051227190918.65c2abac@localhost> <20051227224846.6edcff88@localhost> <200512281027.00252.kernel@kolivas.org> X-Mailer: Sylpheed-Claws 2.0.0-rc1 (GTK+ 2.6.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 28 Dec 2005 10:26:58 +1100 Con Kolivas wrote: > Looking at your top output I see that transcode command generates 7 processes > all likely to be using cpu, and your DD slowdown is almost 7 times... I > assume it all goes away if you nice the transcode up by 3 or more. Yes, if I nice everything to 3 or more (nice -n 3 dvdrip ...) it works, but I would prefer a less weak scheduler (see the other email, with results for various schedulers). Another thing that I've noticed is that things tends to get worse when "transcode" is running for long time (some hours). It happened to me some times (with ingosched and also with staircase if I remember correctly): after some hours of running transcode (with me away from the machine) I've found a totally UNUSABLE system. Transcode was the king of the machine and everything else get almost no CPU time. Switching to a Text-Console takes something like 10s (or something like that). When I was finally logged in as root I've reniced transcode and companyto +19 and the system was usable again ;) To get things even more STRANGE: another time that this happened I've done the same thing except that I've reniced them to "0" (the same nice level they were running) ---> And the system became usable again (with the usual slow down but still usable). This is what I remember. Now I think we can agree that there is something wrong... no? :) -- Paolo Ornati Linux 2.6.15-rc5-plugsched on x86_64