Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753688AbXLHTmq (ORCPT ); Sat, 8 Dec 2007 14:42:46 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750845AbXLHTmj (ORCPT ); Sat, 8 Dec 2007 14:42:39 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:48858 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750789AbXLHTmi (ORCPT ); Sat, 8 Dec 2007 14:42:38 -0500 Date: Sat, 8 Dec 2007 20:42:11 +0100 From: Ingo Molnar To: Parag Warudkar Cc: Thomas Gleixner , "Pallipadi, Venkatesh" , LKML , Andrew Morton , Linus Torvalds Subject: Re: soft lockup - CPU#1 stuck for 15s! [swapper:0] Message-ID: <20071208194211.GA579@elte.hu> References: <82e4877d0712071453h38795e36of26324a4b123fa6c@mail.gmail.com> <924EFEDD5F540B4284297C4DC59F3DEE38C3C2@orsmsx423.amr.corp.intel.com> <82e4877d0712080710g205ba93ag12ee204b15d70fdb@mail.gmail.com> <82e4877d0712080736v12c1e31at9149655ae000fe50@mail.gmail.com> <20071208154755.GA5255@elte.hu> <82e4877d0712080800j6572734ek78a76cf7bb17a7e0@mail.gmail.com> <20071208191330.GA21186@elte.hu> <82e4877d0712081133y49fec9bfyee30a3010b37c435@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <82e4877d0712081133y49fec9bfyee30a3010b37c435@mail.gmail.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 962 Lines: 32 * Parag Warudkar wrote: > Even on 100% idle I get variations that are approx in the same range > when not idle. Clocksource is hpet if that matters. Next I think I > will disable CPU_IDLE, Tickless also try the hpet=disable boot option. > My ssh connection just died - another lockup in dmesg - > > BUG: soft lockup - CPU#1 stuck for 14s! [sshd:509] this would suggest that the softlockup watchdog is correct and indeed there was some lockup of sorts? > $> while :; do time usleep 1111111; done > real 0m1.112s > real 0m1.385s > real 0m1.112s > real 0m1.112s > real 0m1.279s this, if done on an idle system, looks anomalous to me. Does hpet=disable help? Ingo -- 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/