From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754385Ab0IJHmM (ORCPT ); Fri, 10 Sep 2010 03:42:12 -0400 Received: from icebox.esperi.org.uk ([81.187.191.129]:39946 "EHLO mail.esperi.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753145Ab0IJHmL (ORCPT ); Fri, 10 Sep 2010 03:42:11 -0400 To: Artur Skawina Cc: Thomas Gleixner , Venkatesh Pallipadi , Damien Wyart , John Drescher , linux-kernel@vger.kernel.org Subject: Re: [BISECTED] 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (HPET) References: <87zkvx2ese.fsf@spindle.srvr.nix> <20100906053255.GA23340@brouette> <87iq2gyllg.fsf@spindle.srvr.nix> <87wrqu8s1u.fsf_-_@spindle.srvr.nix> <4C8982EF.8030705@gmail.com> From: Nix Emacs: is that a Lisp interpreter in your editor, or are you just happy to see me? Date: Fri, 10 Sep 2010 08:42:00 +0100 In-Reply-To: <4C8982EF.8030705@gmail.com> (Artur Skawina's message of "Fri, 10 Sep 2010 02:59:27 +0200") Message-ID: <87eid282pj.fsf@spindle.srvr.nix> User-Agent: Gnus/5.1008 (Gnus v5.10.8) XEmacs/21.5-b29 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-DCC-URT-Metrics: spindle 1060; Body=6 Fuz1=6 Fuz2=6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10 Sep 2010, Artur Skawina spake thusly: > I'm seeing this too, except here it happens every couple of days of uptime, > lasts for a few minutes, and then goes away. Which made bisecting a bit > impractical... Thank you for doing it. I just happened to be the lucky sod for whom it was consistently going wrong. :) > HW is similar; x64 and X58/82801JI/ICH10, tsc clocksrc. > Did that printk trigger? No. (hm, odd. spindle:~# cat /sys/devices/system/clocksource/clocksource0/current_clocksource tsc spindle:~# grep -i tsc /proc/timer_list spindle:~# grep -i hpet /proc/timer_list Clock Event Device: hpet set_next_event: hpet_legacy_next_event set_mode: hpet_legacy_set_mode I suspect current_clocksource doesn't do what we think it does, or the clocksource and 'clock event device' are not the same.)