From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761451AbYEMVJe (ORCPT ); Tue, 13 May 2008 17:09:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758991AbYEMVJZ (ORCPT ); Tue, 13 May 2008 17:09:25 -0400 Received: from rv-out-0506.google.com ([209.85.198.226]:56863 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752429AbYEMVJY (ORCPT ); Tue, 13 May 2008 17:09:24 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Grz4Jl7deEh76omJvZiijFpBHxG1dy6IzDT7LiABKK4D5dy6Zg0dNNlQ13tNepBFbrTjnRauoqs9RcSV4Vc5Ir86SpZN+rIeIeD4dUxahYIYu/fD8KVJLNssnE8nc3BcNJMz+ox/PIzhAwyxIDfbrEPcwP44DBW+v+Pm11kxU7g= Message-ID: <19f34abd0805131409w2914fbedgb608c7b87c234e2e@mail.gmail.com> Date: Tue, 13 May 2008 23:09:23 +0200 From: "Vegard Nossum" To: "Andi Kleen" Subject: Re: [BISECTED] Lots of "rescheduling IPIs" in powertop Cc: "Ingo Molnar" , "Thomas Gleixner" , "Andreas Herrmann" , "=?UTF-8?Q?S.=C3=87a=C4=9Flar_Onur?=" , Valdis.Kletnieks@vt.edu, "Matt Mackall" , linux-kernel@vger.kernel.org In-Reply-To: <873aol9b73.fsf@basil.nowhere.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20080513204206.GA17781@damson.getinternet.no> <873aol9b73.fsf@basil.nowhere.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 13, 2008 at 10:54 PM, Andi Kleen wrote: > Vegard Nossum writes: > > > > This initially showed up on my 2.6.24.5-85.fc8 (Fedora) kernel. > > > > I have two different systems (one laptop, one desktop) which both show the > > same symptoms, please do tell me if you need any more info. > > What CPUs do they have? And does the problem really go away when > you boot with idle=mwait ? And what does the following program > output? Yes, the problem goes away with idle=mwait. The desktop is a P4: processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 6 model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 5 cpu MHz : 2992.624 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pebs bts pni monitor ds_cpl est tm2 cid cx16 xtpr lahf_lm bogomips : 5990.81 clflush size : 64 (similar for processor 1) # msr 0 The laptop is a Pentium Dual-Core: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Pentium(R) Dual CPU T2310 @ 1.46GHz stepping : 13 cpu MHz : 800.000 cache size : 1024 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 2930.23 clflush size : 64 (similar for processor 1) # ./msr 1110 Vegard -- "The animistic metaphor of the bug that maliciously sneaked in while the programmer was not looking is intellectually dishonest as it disguises that the error is the programmer's own creation." -- E. W. Dijkstra, EWD1036