Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262700AbVDHG0z (ORCPT ); Fri, 8 Apr 2005 02:26:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262702AbVDHG0z (ORCPT ); Fri, 8 Apr 2005 02:26:55 -0400 Received: from ylpvm15-ext.prodigy.net ([207.115.57.46]:231 "EHLO ylpvm15.prodigy.net") by vger.kernel.org with ESMTP id S262700AbVDHG0w (ORCPT ); Fri, 8 Apr 2005 02:26:52 -0400 Date: Thu, 7 Apr 2005 23:25:38 -0700 From: Tony Lindgren To: Frank Sorenson Cc: linux-kernel@vger.kernel.org, Benjamin Herrenschmidt , Pavel Machek , Arjan van de Ven , Martin Schwidefsky , Andrea Arcangeli , George Anzinger , Thomas Gleixner , john stultz , Zwane Mwaikambo , Lee Revell , Thomas Renninger Subject: Re: [PATCH] Dynamic Tick version 050406-1 Message-ID: <20050408062537.GB4477@atomide.com> References: <20050406083000.GA8658@atomide.com> <425451A0.7020000@tuxrocks.com> <20050407082136.GF13475@atomide.com> <4255A7AF.8050802@tuxrocks.com> <4255B247.4080906@tuxrocks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4255B247.4080906@tuxrocks.com> User-Agent: Mutt/1.5.8i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1664 Lines: 43 * Frank Sorenson [050407 15:21]: > Frank Sorenson wrote: > > Tony Lindgren wrote: > > > >>Thanks for trying it out. What kind of hardware do you have? Does it > >>have HPET? It looks like no suitable timer for dyn-tick is found... > >>Maybe the following patch helps? > >> > >>Tony > > > > > > Does 'different crash' qualify as "helping"? :) > > Update: > The patch does seem to fix the crash. This "different crash" I > mentioned appears to be related to the netconsole I was using (serial > console produces stairstepping text, netconsole seems to duplicate > lines--go figure). Without netconsole, dynamic tick appears to be > working, so I'm not sure whether this is a netconsole bug or a dynamic > tick bug. This might be because time does not run correctly, see below. > While dynamic tick no longer panics, with dynamic tick, my system slows > to whatever is slower than a crawl. It now takes 6 minutes 50 seconds > to boot all the way up, compared to 1 minute 35 seconds with my 2.6.12 > kernel without the dynamic tick patch. I'm not sure where this slowdown > is occurring yet. I think I have an idea on what's going on; Your system does not wake to APIC interrupt, and the system timer updates time only on other interrupts. I'm experiencing the same on a loaner ThinkPad T30. I'll try to do another patch today. Meanwhile it now should work without lapic in cmdline. Tony - 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/