From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759268AbXK2IxT (ORCPT ); Thu, 29 Nov 2007 03:53:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755524AbXK2IxH (ORCPT ); Thu, 29 Nov 2007 03:53:07 -0500 Received: from mfe1.polimi.it ([131.175.12.23]:47033 "EHLO polimi.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755520AbXK2IxF (ORCPT ); Thu, 29 Nov 2007 03:53:05 -0500 Date: Thu, 29 Nov 2007 09:50:34 +0100 From: Stefano Brivio To: "Rafael J. Wysocki" Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Michael Buesch Subject: Re: [BUG] jiffies counter leaps in 2.6.24-rc3 Message-ID: <20071129095034.24b3fc59@morte> In-Reply-To: <200711242031.26134.rjw@sisk.pl> References: <20071124175112.58193424@morte> <200711241948.58881.rjw@sisk.pl> <20071124194635.58f5a44b@morte> <200711242031.26134.rjw@sisk.pl> X-Mailer: Claws Mail 3.0.2 (GTK+ 2.12.1; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-PMX-Version: 5.3.3.310218, Antispam-Engine: 2.5.2.311128, Antispam-Data: 2007.11.29.2933 X-PerlMx-Spam: Gauge=IIIIIII, Probability=7%, Report='RDNS_GENERIC_POOLED 0, RDNS_SUSP 0, RDNS_SUSP_GENERIC 0, __CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __HAS_X_MAILER 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0, __STOCK_PHRASE_24 0' Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Ok, I found out how to reliably reproduce this bug. The root session issue was a bit weird, but I noticed I usually switch to root only when I need to change the CPU frequency. And here's what happens: # cpuspeedy min [after some time...] Nov 29 09:42:31 morte [ 4408.722597] b43-phy0 ERROR: PHY transmission error # cpuspeedy max Nov 29 09:42:41 morte [ 1177.238599] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 540 (2160/4) It looks like jiffies get scaled exactly by a 3.75 factor, which is / here. I use acpi-cpufreq and this is my (only) CPU: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.50GHz stepping : 6 cpu MHz : 1500.000 cache size : 2048 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe bts est tm2 bogomips : 2993.49 clflush size : 64 Any hint? -- Ciao Stefano