From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267399AbUHPDgC (ORCPT ); Sun, 15 Aug 2004 23:36:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267400AbUHPDgC (ORCPT ); Sun, 15 Aug 2004 23:36:02 -0400 Received: from viper.oldcity.dca.net ([216.158.38.4]:34792 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S267399AbUHPDfw (ORCPT ); Sun, 15 Aug 2004 23:35:52 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8.1-P0 From: Lee Revell To: Ingo Molnar Cc: Florian Schmidt , linux-kernel , Felipe Alfaro Solana In-Reply-To: <20040816032806.GA11750@elte.hu> References: <20040812235116.GA27838@elte.hu> <1092382825.3450.19.camel@mindpipe> <20040813104817.GI8135@elte.hu> <1092432929.3450.78.camel@mindpipe> <20040814072009.GA6535@elte.hu> <20040815115649.GA26259@elte.hu> <20040816022554.16c3c84a@mango.fruits.de> <1092622121.867.109.camel@krustophenia.net> <20040816023655.GA8746@elte.hu> <1092624221.867.118.camel@krustophenia.net> <20040816032806.GA11750@elte.hu> Content-Type: text/plain Message-Id: <1092627399.867.147.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sun, 15 Aug 2004 23:36:40 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2004-08-15 at 23:28, Ingo Molnar wrote: > * Lee Revell wrote: > > > I believe the constant-time behavior that I reported was an artifact > > of ALSA xrun debugging. Now it seems like the latency produced *does* > > correspond directly to the amount of memory being mlockall'ed. If > > ./mlockall-test 1500 triggers an xrun at all it's ~0.2ms. 3000 > > triggers a ~1ms xrun, and 10000 a ~3 ms xrun. > > could you try more extreme values - e.g. does 100 MB cause a 30 msec > xrun? > This causes a series of xruns, ranging from maybe 2 to 10ms. Lee