From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262378AbULOQX1 (ORCPT ); Wed, 15 Dec 2004 11:23:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262379AbULOQX0 (ORCPT ); Wed, 15 Dec 2004 11:23:26 -0500 Received: from viper.oldcity.dca.net ([216.158.38.4]:54221 "HELO viper.oldcity.dca.net") by vger.kernel.org with SMTP id S262378AbULOQXX (ORCPT ); Wed, 15 Dec 2004 11:23:23 -0500 Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc3-mm1-V0.7.33-0 From: Lee Revell To: Ingo Molnar Cc: Paul Davis , Steven Rostedt , LKML , Rui Nuno Capela , Mark Johnson , "K.R. Foley" , Bill Huey , Adam Heath , Florian Schmidt , Thomas Gleixner , Fernando Pablo Lopez-Lezcano , George Anzinger In-Reply-To: <20041215093246.GE13551@elte.hu> References: <1103064432.14699.69.camel@krustophenia.net> <200412142257.iBEMvYPj014838@localhost.localdomain> <20041215093246.GE13551@elte.hu> Content-Type: text/plain Date: Wed, 15 Dec 2004 11:23:21 -0500 Message-Id: <1103127802.18982.24.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Evolution 2.0.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2004-12-15 at 10:32 +0100, Ingo Molnar wrote: > * Paul Davis wrote: > > > the latter. to send MIDI Clock or MIDI Timecode requires an interrupt > > source that is not locked to jiffie-ish intervals or power-of-2 > > related intervals. For example, MTC requires sending 2 bytes roughly > > every 0.8msec. Sending them every msec isn't good enough, in general. > > yeah, i can understand that - 20% slower music is bad, even to kernel > hackers ;-) It's a bit worse than that. If there is excessive jitter in your MIDI clock/MTC then your other devices will fail to lock on to it at all - it does not degrade gracefully. Lee