From owner-freebsd-acpi@FreeBSD.ORG Fri Jun 27 15:28:11 2008 Return-Path: Delivered-To: freebsd-acpi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BF7E21065670 for ; Fri, 27 Jun 2008 15:28:11 +0000 (UTC) (envelope-from david@wood2.org.uk) Received: from v-smtp-auth-relay-2.gradwell.net (v-smtp-auth-relay-2.gradwell.net [79.135.125.41]) by mx1.freebsd.org (Postfix) with ESMTP id 380508FC14 for ; Fri, 27 Jun 2008 15:28:10 +0000 (UTC) (envelope-from david@wood2.org.uk) Received: from argon.wood2.org.uk ([82.71.104.124] country=GB ident=postmaster*pop3#wood2$org$uk) by v-smtp-auth-relay-2.gradwell.net with esmtpa (Gradwell gwh-smtpd 1.290) id 48650709.5fd3.233; Fri, 27 Jun 2008 16:28:09 +0100 (envelope-sender ) Message-ID: Date: Fri, 27 Jun 2008 16:27:03 +0100 To: David Wood From: David Wood References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain;charset=us-ascii;format=flowed User-Agent: Turnpike/6.06-M (<+3pRuLtW5oZaqwOH6WUZxwfIbY>) Cc: freebsd-acpi@freebsd.org Subject: Re: Dell PowerEdge 2950 III - CPU power management problems X-BeenThere: freebsd-acpi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: ACPI and power management development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Jun 2008 15:28:11 -0000 Dear all, In message , David Wood writes >I'm having problems with CPU power management on a Dell PowerEdge 2950 >III. > >I've posted this to freebsd-acpi in the first instance - though it may >finish up belonging on freebsd-stable. As I am almost certain there are >bugs in teh DSDT, I thought I'd start on freebsd-acpi. Dell have just shipped the 2.3.1 BIOS for this hardware, which fixes the DSDT bugs. If I have correctly understood recent messages on freebsd-stable, CPU frequency control and Enhanced SpeedStep is broken for modern Core 2 and Xeon processors. At least my 2950 III is now ready for whatever fixes may become available to that code. I believe the problem may be that FreeBSD doesn't know it needs to change the frequency of several cores at once - after all, my 8 core box is two chips of two processors of two cores each. If any developer is interested in fixing the CPU frequency control / Enhanced SpeedStep code, I might be able to contribute a small amount of finance towards this work. Please email me directly. Best wishes, David -- David Wood david@wood2.org.uk