From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266458AbUGUFid (ORCPT ); Wed, 21 Jul 2004 01:38:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266481AbUGUFid (ORCPT ); Wed, 21 Jul 2004 01:38:33 -0400 Received: from mx1.elte.hu ([157.181.1.137]:13231 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S266458AbUGUFib (ORCPT ); Wed, 21 Jul 2004 01:38:31 -0400 Date: Wed, 21 Jul 2004 07:30:07 +0200 From: Ingo Molnar To: Andrew Morton Cc: Lee Revell , linux-audio-dev@music.columbia.edu, arjanv@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch Message-ID: <20040721053007.GA8376@elte.hu> References: <20040709182638.GA11310@elte.hu> <20040710222510.0593f4a4.akpm@osdl.org> <1089673014.10777.42.camel@mindpipe> <20040712163141.31ef1ad6.akpm@osdl.org> <1089677823.10777.64.camel@mindpipe> <20040712174639.38c7cf48.akpm@osdl.org> <20040719102954.GA5491@elte.hu> <1090380467.1212.3.camel@mindpipe> <20040721000348.39dd3716.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040721000348.39dd3716.akpm@osdl.org> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Andrew Morton wrote: > > discovered I can reliably produce a large XRUN by toggling Caps Lock, > > Scroll Lock, or Num Lock. This is with 2.6.8-rc1-mm1 + voluntary > > preempt > > That's odd. I wonder if the hardware is sick. What is the duration is the > underrun? The info you sent didn't include that. no, it's the ps2 driver that is sick. The ps2 keyboard driver is one of the few places that busy-polls for IRQ completion from within a tasklet context for things like led switching (yuck) - this can cause many millisecs delays on all boards i tried. Ingo