From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 20 Sep 2001 21:58:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 20 Sep 2001 21:58:03 -0400 Received: from mailb.telia.com ([194.22.194.6]:22541 "EHLO mailb.telia.com") by vger.kernel.org with ESMTP id ; Thu, 20 Sep 2001 21:57:48 -0400 Message-Id: <200109210157.f8L1vwm15951@mailb.telia.com> Content-Type: text/plain; charset="iso-8859-1" From: Roger Larsson To: Alan Cox Subject: Re: [PATCH] Preemption Latency Measurement Tool Date: Fri, 21 Sep 2001 03:53:08 +0200 X-Mailer: KMail [version 1.3.1] Cc: oxymoron@waste.org (Oliver Xymoron), Dieter.Nuetzel@hamburg.de (Dieter =?iso-8859-1?q?N=FCtzel?=), stefan@space.twc.de (Stefan Westerfeld), rml@tech9.net (Robert Love), linux-kernel@vger.kernel.org (linux-kernel) In-Reply-To: <200109210143.f8L1hnm08604@mailb.telia.com> In-Reply-To: <200109210143.f8L1hnm08604@mailb.telia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Friday 21 September 2001 03.38, Roger Larsson wrote: > On Friday 21 September 2001 03.03, Alan Cox wrote: > > > If this analysis is correct: > > > We really need to run RT processes with RT priorities! > > > > > > It is also possible that multimedia applications needs to be rewritten > > > = to > > > > I dont believe this is an application problem. Applications allocating > > memory can end up doing page outs for other people. Its really important > > they dont get stuck doing a huge amount of pageout work for someone else. > > Thats one thing I seem to be seeing with the 10pre11 VM. > > > > Sound cards have a lot of buffering, we are talking 64-128Kbytes + on > > card buffers. Thats 0.25-0.5 seconds at 48Khz 16bit stereo > > Hmm.. > > The yield we do in __alloc_pages is it really correct? > 1. Suppose it is not we that are the problem. > 2. Suppose there are lots of other processes that gets to run. > 3. If kswapd had higher prio, it would start to run without us giving up... > > I have to try... > They were already gone in -pre12! But I was running -pre10... Others? Dieter is running -pre12... I will test it anyways... /RogerL -- Roger Larsson Skellefteċ Sweden