From mboxrd@z Thu Jan 1 00:00:00 1970 From: Timo Hoenig Subject: RE: [PATCH 2.6.18 1/1] ACPI: limit cstate on noisy thinkpad t43/p models Date: Sun, 24 Sep 2006 13:38:02 +0200 Message-ID: <1159097883.5437.12.camel@nouse.suse.de> References: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from cantor2.suse.de ([195.135.220.15]:13986 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S1752005AbWIXLiW (ORCPT ); Sun, 24 Sep 2006 07:38:22 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Brown, Len" Cc: shadow@serverart.org, linux-acpi@vger.kernel.org Hi, On Thu, 2006-09-21 at 18:05 -0400, Brown, Len wrote: > Turning off C3 is a pretty big hammer... Indeed. I think it is a more general problem. The systems with Intel Core Duo I got my hands on all show the symptom: Once the system is idle, the second core begins to whine. It's annoying in quiet environments. * Turning off the second core makes the whining stop. * Booting with processor.max_cstate=2 does also make the whining go away; but it's a bad idea on laptops if once wants to gain a long run on batteries. Tested with HZ=250; I'll check whether HZ=100/1000 helps. Timo