Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753737AbXLIWcR (ORCPT ); Sun, 9 Dec 2007 17:32:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751138AbXLIWcF (ORCPT ); Sun, 9 Dec 2007 17:32:05 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:51690 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751307AbXLIWcC (ORCPT ); Sun, 9 Dec 2007 17:32:02 -0500 Date: Sun, 9 Dec 2007 14:30:59 -0800 From: Arjan van de Ven To: "Parag Warudkar" Cc: "Ingo Molnar" , "Thomas Gleixner" , "Pallipadi, Venkatesh" , LKML , "Andrew Morton" , "Linus Torvalds" Subject: Re: soft lockup - CPU#1 stuck for 15s! [swapper:0] Message-ID: <20071209143059.7128abf5@laptopd505.fenrus.org> In-Reply-To: <82e4877d0712091357u41973a24v38c4ad18ad596de5@mail.gmail.com> References: <924EFEDD5F540B4284297C4DC59F3DEE38C3C2@orsmsx423.amr.corp.intel.com> <20071208191330.GA21186@elte.hu> <82e4877d0712081133y49fec9bfyee30a3010b37c435@mail.gmail.com> <20071208194211.GA579@elte.hu> <82e4877d0712081208u335c968csd1d3e9259cdd2920@mail.gmail.com> <20071208201137.GA13451@elte.hu> <82e4877d0712081246x4d788c36i908916185611fa94@mail.gmail.com> <20071208125144.734e9f81@laptopd505.fenrus.org> <82e4877d0712081304r19721b43w78b294ea8d470405@mail.gmail.com> <82e4877d0712081512s2b5a72aewbe396f28305ac963@mail.gmail.com> <82e4877d0712091357u41973a24v38c4ad18ad596de5@mail.gmail.com> Organization: Intel X-Mailer: Claws Mail 3.0.2 (GTK+ 2.12.1; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1131 Lines: 26 On Sun, 9 Dec 2007 16:57:38 -0500 "Parag Warudkar" wrote: > On Dec 8, 2007 6:12 PM, Parag Warudkar > wrote: > > No problems after disabling CONFIG_HIGHRES_TIMERS , CONFIG_CPU_IDLE > > and CONFIG_NO_HZ. > > > > I will try enabling them one by one - HRT, NOHZ and CPU_IDLE last - > > that way we can at least tell what is required to be hit with this > > problem. > > Looks like CPU_IDLE=y is necessary for the problem to show up. > With CPU_IDLE=n HRT+NO_HZ+TICK_ONESHOT does not give soft lockup > problems. (Actually with HIGH_RES_TIMERS=NO_HZ=TICK_ONESHOT=y I do > see short freezes on ssh - when I cannot type anything for may be a > second even under 100% idle. But Soft Lock up doesnt show up in dmesg > with this configuration.) starts to sound like something is turning off the clock during a somewhat deeper C-state... -- 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/