From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752244AbXCDSdJ (ORCPT ); Sun, 4 Mar 2007 13:33:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752350AbXCDSdJ (ORCPT ); Sun, 4 Mar 2007 13:33:09 -0500 Received: from wx-out-0506.google.com ([66.249.82.226]:11017 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752244AbXCDSdH (ORCPT ); Sun, 4 Mar 2007 13:33:07 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:references; b=mM+EDC3OJpM76l7ygC2q6a7KsTVUM02OVwjNiyRhOwEDn0bZStR+IDVm/HVt46B2VUdzdPndxcrv2nAfTmAIdQ2qVzXKZUoWuYS58iBnaJDXVpcq5tBG+RvnNfyzmJfYOd300jUrXvTR91YT3k2ic15ChOWpMtCVcduqg7fJE/8= Message-ID: <3d8471ca0703041033v689b51dfuba0b09fc979d7698@mail.gmail.com> Date: Sun, 4 Mar 2007 19:33:06 +0100 From: "Guillaume Chazarain" To: "Andi Kleen" Subject: Re: [1/3] Bugfix: Don't use the TSC in sched_clock if unstable Cc: "Ingo Molnar" , linux-kernel@vger.kernel.org In-Reply-To: <200703041825.39361.ak@suse.de> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_118976_19025661.1173033186790" References: <3d8471ca0703031341l1768fe7rccf40712e452ea09@mail.gmail.com> <200703041537.27581.ak@suse.de> <3d8471ca0703040741h4eff73a3wd67d648d52497e34@mail.gmail.com> <200703041825.39361.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org ------=_Part_118976_19025661.1173033186790 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline 2007/3/4, Andi Kleen : > On what hardware? Pentium M 798 MHz -> 2GHz > And how many frequency transitions do you have per second? 10 in a kernel compile exhibiting audio skips. Anyway, the "Clocksource tsc unstable (delta = -263211549 ns)" line in the dmesg I attached to the previous mail confirms IMHO that my TSC is too unstable for scheduling purpose. 15 minutes after booting, including a kernel compile halted on the first audio skip, I have this in /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table From : To : 1995000 1596000 1330000 1064000 798000 1995000: 0 67 101 128 367 1596000: 20 0 3 3 41 1330000: 21 0 0 10 73 1064000: 30 0 0 0 111 798000: 592 0 0 0 0 Nothing alarming I presume. Thanks. -- Guillaume ------=_Part_118976_19025661.1173033186790 Content-Type: application/octet-stream; name=cpuinfo Content-Transfer-Encoding: base64 X-Attachment-Id: f_eyvtlc6y Content-Disposition: attachment; filename="cpuinfo" cHJvY2Vzc29yCTogMAp2ZW5kb3JfaWQJOiBHZW51aW5lSW50ZWwKY3B1IGZhbWlseQk6IDYKbW9k ZWwJCTogMTMKbW9kZWwgbmFtZQk6IEludGVsKFIpIFBlbnRpdW0oUikgTSBwcm9jZXNzb3IgMi4w MEdIegpzdGVwcGluZwk6IDgKY3B1IE1IegkJOiA3OTguMDAwCmNhY2hlIHNpemUJOiAyMDQ4IEtC CmZkaXZfYnVnCTogbm8KaGx0X2J1ZwkJOiBubwpmMDBmX2J1Zwk6IG5vCmNvbWFfYnVnCTogbm8K ZnB1CQk6IHllcwpmcHVfZXhjZXB0aW9uCTogeWVzCmNwdWlkIGxldmVsCTogMgp3cAkJOiB5ZXMK ZmxhZ3MJCTogZnB1IHZtZSBkZSBwc2UgdHNjIG1zciBwYWUgbWNlIGN4OCBhcGljIHNlcCBtdHJy IHBnZSBtY2EgY21vdiBwYXQgY2xmbHVzaCBkdHMgYWNwaSBtbXggZnhzciBzc2Ugc3NlMiBzcyB0 bSBwYmUgZXN0IHRtMgpib2dvbWlwcwk6IDE1OTYuNjIKY2xmbHVzaCBzaXplCTogNjQKCg== ------=_Part_118976_19025661.1173033186790--