From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262462AbVGLW3O (ORCPT ); Tue, 12 Jul 2005 18:29:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262475AbVGLWYd (ORCPT ); Tue, 12 Jul 2005 18:24:33 -0400 Received: from dvhart.com ([64.146.134.43]:31414 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S262471AbVGLWWq (ORCPT ); Tue, 12 Jul 2005 18:22:46 -0400 Date: Tue, 12 Jul 2005 15:22:36 -0700 From: "Martin J. Bligh" Reply-To: "Martin J. Bligh" To: Lee Revell Cc: "Kjetil Svalastog Matheussen " , Chris Friesen , Diego Calleja , azarah@nosferatu.za.org, akpm@osdl.org, cw@f00f.org, linux-kernel@vger.kernel.org, torvalds@osdl.org, christoph@lameter.org Subject: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt Message-ID: <278570000.1121206956@flay> In-Reply-To: <1121201925.10580.24.camel@mindpipe> References: <200506231828.j5NISlCe020350@hera.kernel.org> <20050708214908.GA31225@taniwha.stupidest.org> <20050708145953.0b2d8030.akpm@osdl.org> <1120928891.17184.10.camel@lycan.lan> <1120932991.6488.64.camel@mindpipe> <20050709203920.394e970d.diegocg@gmail.com> <1120934466.6488.77.camel@mindpipe> <176640000.1121107087@flay> <1121113532.2383.6.camel@mindpipe> <42D2D912.3090505@nortel.com> <1121128260.2632.12.camel@mindpipe> <165840000.1121141256@[10.10.2.4]> <1121141602.2632.31.camel@mindpipe> <188690000.1121142633@[10.10.2.4]> <1121201925.10580.24.camel@mindpipe> X-Mailer: Mulberry/2.1.2 (Linux/x86) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --On Tuesday, July 12, 2005 16:58:44 -0400 Lee Revell wrote: > On Mon, 2005-07-11 at 21:30 -0700, Martin J. Bligh wrote: >> Some sort of comprimise has to be struck for now, until we get sub-HZ >> timers. I'd prefer 100, personally (I had that set as default in my tree >> for a long time). Some people would prefer 1000 or even more, maybe. >> 250/300 seems like a reasonable comprimise to me. Exactly what problems >> *does* it cause (in visible effect, not "timers are less granular"). >> Jittery audio/video? How much worse is it? > > OK, here's a real world example, taken straight from the linux-audio-dev > list today. OK, what level causes Midi stuttering to stop then, under some fairly reasonable load? Of course ... if we set HZ to 100000, we'll get higher res still ... the question is how high it *needs* to be ;-) M.