Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751115AbWI1X3a (ORCPT ); Thu, 28 Sep 2006 19:29:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751128AbWI1X3a (ORCPT ); Thu, 28 Sep 2006 19:29:30 -0400 Received: from xenotime.net ([66.160.160.81]:62624 "HELO xenotime.net") by vger.kernel.org with SMTP id S1751115AbWI1X33 (ORCPT ); Thu, 28 Sep 2006 19:29:29 -0400 Date: Thu, 28 Sep 2006 16:30:46 -0700 From: Randy Dunlap To: Tilman Schmidt Cc: Andi Kleen , Andrew Morton , linux-kernel@vger.kernel.org, Ingo Molnar , jbeulich@novell.com Subject: Re: [2.6.18-rc7-mm1] slow boot Message-Id: <20060928163046.055b3ce0.rdunlap@xenotime.net> In-Reply-To: <451C58AC.5060601@imap.cc> References: <4516B966.3010909@imap.cc> <20060924145337.ae152efd.akpm@osdl.org> <451BFFA9.4030000@imap.cc> <200609281912.01858.ak@suse.de> <451C58AC.5060601@imap.cc> Organization: YPO4 X-Mailer: Sylpheed version 2.2.9 (GTK+ 2.8.10; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1539 Lines: 44 On Fri, 29 Sep 2006 01:20:12 +0200 Tilman Schmidt wrote: > Am 28.09.2006 19:12 schrieb Andi Kleen: > > On Thursday 28 September 2006 19:00, Tilman Schmidt wrote: > > > > missing context here, but ... > > Forwarded by separate mail. > > >> x86_64-mm-i386-stacktrace-unwinder.patch > [...] > >> Backing out just this patch from 2.6.18-mm1 (and resolving conflicts > >> manually the obvious way) gets the boot time back to normal (ie. as > >> fast as 2.6.18 mainline) on my > >> Linux gx110 2.6.18-mm1-noinitrd #2 PREEMPT Thu Sep 28 18:48:32 CEST 2006 i686 i686 i386 GNU/Linux > >> machine. > > > > Hmm, i assume you have lockdep on. > > Indeed. > > > The new backtracer is of course slower > > than the old one and it will slow down lockdep which takes a lot of backtraces. > > But it shouldn't be a significant slowdown. > > Unfortunately, it is. Boot time roughly doubles from 39 to 76 secs. > > > Can you perhaps boot with profile=1 and then send readprofile output after > > boot? > > I'm afraid I'll need instructions for that. I assume "profile=1" > is to be appended to the kernel command line; but how do I > retrieve that readprofile output you are asking for? Use 'readprofile'. Usage is described in Documentation/basic_profiling.txt in the kernel source tree. --- ~Randy - 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/