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Date: Tue, 7 Jul 2009 08:50:14 +0200 From: Jarek Poplawski <jarkao2@...il.com> To: Andres Freund <andres@...razel.de> Cc: Joao Correia <joaomiguelcorreia@...il.com>, Arun R Bharadwaj <arun@...ux.vnet.ibm.com>, Thomas Gleixner <tglx@...utronix.de>, Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 ( possibly?caused by netem) On Mon, Jul 06, 2009 at 07:26:43PM +0200, Andres Freund wrote: > On Monday 06 July 2009 19:23:18 Joao Correia wrote: > > Hello > > > > Since i already had the kernel compiled and ready to boot when i read > > this, i gave it a go anyway :-). > > > > I can reproduce the freeze with those 4 patches applied, so i can > > confirm that its, at least, related to, or exposed by, those patches. > > There must be something else too, or its just too much fuzziness, but > > the freeze takes a bit more time (approximately five minutes, give or > > take) compared to the instant freeze before, but its there with the > > patches, and without them, no freeze. > > > > I assume there isnt a "safe" way to get them out of current .31-rc's, > > right? > `echo 0 > /proc/sys/kernel/timer_migration` should mitigate the problem. I guess it should fix it entirely. Btw., here is a patch disabling the timers' part, so to make it hrtimers only. Could you try? Thanks, Jarek P. --- diff --git a/kernel/timer.c b/kernel/timer.c index 0b36b9e..011429c 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -634,7 +634,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires, cpu = smp_processor_id(); -#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) +#if 0 if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) { int preferred_cpu = get_nohz_load_balancer(); -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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