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 21:43:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 20 Sep 2001 21:43:43 -0400 Received: from mailb.telia.com ([194.22.194.6]:8968 "EHLO mailb.telia.com") by vger.kernel.org with ESMTP id ; Thu, 20 Sep 2001 21:43:38 -0400 Message-Id: <200109210143.f8L1hnm08604@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 03:38:59 +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: In-Reply-To: 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 03.03, 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... /RogerL -- Roger Larsson Skellefteċ Sweden