From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jarek Poplawski Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 ( possibly?caused by netem) Date: Thu, 9 Jul 2009 00:07:49 +0200 Message-ID: <20090708220749.GA3666@ami.dom.local> References: <200907031326.21822.andres@anarazel.de> <200907071811.27570.andres@anarazel.de> <20090708080852.GC3148@ami.dom.local> <200907081029.34527.andres@anarazel.de> <20090708091344.GD3148@ami.dom.local> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andres Freund , Arun R Bharadwaj , Thomas Gleixner , Stephen Hemminger , netdev@vger.kernel.org, LKML To: Joao Correia Return-path: Received: from mail-fx0-f218.google.com ([209.85.220.218]:51319 "EHLO mail-fx0-f218.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755171AbZGHWIL (ORCPT ); Wed, 8 Jul 2009 18:08:11 -0400 Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On Wed, Jul 08, 2009 at 10:44:47PM +0100, Joao Correia wrote: > Hello again Hello! ... > So again, the only thing that stops that freeze is `echo 0 >> > /proc/sys/kernel/timer_migration`. Apologies for pointing you in the > wrong direction. No problem: the direction is almost right, we only need one U-turn ;-) In case you're not bored or too bored, one little patch to check the other side (after reverting the previous patch). Thanks, Jarek P. --- kernel/hrtimer.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 9002958..23387e4 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -203,7 +203,7 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base, int cpu, preferred_cpu = -1; cpu = smp_processor_id(); -#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) +#if 0 if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) { preferred_cpu = get_nohz_load_balancer(); if (preferred_cpu >= 0)