Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262714AbVBCDFk (ORCPT ); Wed, 2 Feb 2005 22:05:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262817AbVBCDFj (ORCPT ); Wed, 2 Feb 2005 22:05:39 -0500 Received: from ylpvm29-ext.prodigy.net ([207.115.57.60]:62119 "EHLO ylpvm29.prodigy.net") by vger.kernel.org with ESMTP id S262714AbVBCDFV (ORCPT ); Wed, 2 Feb 2005 22:05:21 -0500 Date: Wed, 2 Feb 2005 19:04:00 -0800 From: Tony Lindgren To: Pavel Machek Cc: Benjamin Herrenschmidt , Arjan van de Ven , Martin Schwidefsky , Andrea Arcangeli , George Anzinger , Thomas Gleixner , john stultz , Zwane Mwaikambo , Lee Revell , linux-kernel@vger.kernel.org Subject: Re: [PATCH] Dynamic tick, version 050127-1 Message-ID: <20050203030359.GL13984@atomide.com> References: <20050127212902.GF15274@atomide.com> <20050201110006.GA1338@elf.ucw.cz> <20050201204008.GD14274@atomide.com> <20050201212542.GA3691@openzaurus.ucw.cz> <20050201230357.GH14274@atomide.com> <20050202141105.GA1316@elf.ucw.cz> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="d6Gm4EdcadzBjdND" Content-Disposition: inline In-Reply-To: <20050202141105.GA1316@elf.ucw.cz> User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2247 Lines: 61 --d6Gm4EdcadzBjdND Content-Type: text/plain; charset=us-ascii Content-Disposition: inline * Pavel Machek [050202 06:13]: > > Hi! > > > > > > I used your config advices from second mail, still it does not work as > > > > > expected: system gets "too sleepy". Like it takes a nap during boot > > > > > after "dyn-tick: Maximum ticks to skip limited to 1339", and key is > > > > > needed to make it continue boot. Then cursor stops blinking and > > > > > machine is hung at random intervals during use, key is enough to awake > > > > > it. > > > > > > > > Hmmm, that sounds like the local APIC does not wake up the PIT > > > > interrupt properly after sleep. Hitting the keys causes the timer > > > > interrupt to get called, and that explains why it keeps running. But > > > > the timer ticks are not happening as they should for some reason. > > > > This should not happen (tm)... > > > > > > :-). Any ideas how to debug it? Previous version of patch seemed to work better... > > > > I don't think it's HPET timer, or CONFIG_SMP. It also looks like your > > local APIC timer is working. > > I turned off CONFIG_PREEMPT, but nothing changed :-(. What about reprogramming the timers in time.c after the sleep? Do you to dyn_tick->skip = 1; part in dyn_tick_timer_interrupt? It could also be that the reprogamming of PIT timer does not work on your machine. I chopped off the udelays there... Can you try something like this: --d6Gm4EdcadzBjdND Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename=patch-pit-udelay --- a/arch/i386/kernel/time.c 2005-01-27 12:58:04 -08:00 +++ b/arch/i368/kernel/time.c 2005-02-02 19:01:31 -08:00 @@ -479,8 +480,11 @@ spin_lock_irqsave(&i8253_lock, flags); outb_p(0x34, PIT_MODE); /* binary, mode 2, LSB/MSB, ch 0 */ + udelay(10); outb_p(skip & 0xff, PIT_CH0); /* LSB */ + udelay(10); outb(skip >> 8, PIT_CH0); /* MSB */ + udelay(10); spin_unlock_irqrestore(&i8253_lock, flags); } --d6Gm4EdcadzBjdND-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/