From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757544AbZKKPGf (ORCPT ); Wed, 11 Nov 2009 10:06:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757149AbZKKPGe (ORCPT ); Wed, 11 Nov 2009 10:06:34 -0500 Received: from lucidpixels.com ([75.144.35.66]:38218 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757115AbZKKPGe (ORCPT ); Wed, 11 Nov 2009 10:06:34 -0500 Date: Wed, 11 Nov 2009 10:06:39 -0500 (EST) From: Justin Piszcz To: linux-kernel@vger.kernel.org Subject: Kernel: 2.6.31.5: CE: hpet increasing min_delta_ns: What do these messages mean? Message-ID: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="-1463747160-104920207-1257951999=:6957" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1463747160-104920207-1257951999=:6957 Content-Type: TEXT/PLAIN; format=flowed; charset=ISO-8859-15 Content-Transfer-Encoding: QUOTED-PRINTABLE Hello, System: Intel DP55KG CPU: Intel Core i870 I see these messages in my kernel log: (2.6.31.5) [ 48.886129] CE: hpet increasing min_delta_ns to 15000 nsec [ 3258.107039] CE: hpet increasing min_delta_ns to 22500 nsec [53705.451463] CE: hpet increasing min_delta_ns to 33750 nsec I only see them when ACPI_FREQ and NO_HZ are enabled, to take advantage of turbo boost. It is not the result of throttling: # cat /sys/devices/system/cpu/*/thermal_throttle/count 0 0 0 0 0 0 0 0 Temps are also good, 1 core @ 100% CPU: Core 0: +41.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 1: +41.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 2: +54.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 3: +54.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 4: +42.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 5: +42.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 6: +42.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C)=20 Core 7: +42.0=B0C (high =3D +84.0=B0C, crit =3D +100.0=B0C) I see various discussions on the meaning of these messages but no clear answer. Also in reference to loading ACPI_FREQ I mentioned before that when this module is loaded and there is no CPU activity, there is a high pitch noise from the CPU/VRM presumably, when ACPI_FREQ is not loaded, this does not occur, is this expected? Justin. ---1463747160-104920207-1257951999=:6957--