From mboxrd@z Thu Jan 1 00:00:00 1970 From: Len Brown Subject: Re: SMP C-states on x86_64 Status Date: Mon, 6 Nov 2006 12:44:55 -0500 Message-ID: <200611061244.56455.len.brown@intel.com> References: <1162726672.25981.275035845@webmail.messagingengine.com> Reply-To: Len Brown Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:3506 "EHLO hera.kernel.org") by vger.kernel.org with ESMTP id S1753600AbWKFRm1 (ORCPT ); Mon, 6 Nov 2006 12:42:27 -0500 In-Reply-To: <1162726672.25981.275035845@webmail.messagingengine.com> Content-Disposition: inline Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Mathew Brown Cc: linux-acpi@vger.kernel.org On Sunday 05 November 2006 06:37, Mathew Brown wrote: > Hi, > I just saw Adrian's post on a patch to add SMP C-states on x86_64 to > kernel 2.6.16. Is there anywhere I can find the current status of > C-states on SMP machines? I have a 16-core machine running RHEL with > kernel 2.6.9-34 and it shows only C0, nothing else. I checked the > DSDT and it compiled without error. Any ideas? Thanks for your help. This support (bugzilla 5653) shipped starting in 2.6.18, and I sent it to Adrian for 2.6.16.stable -- and it appears it will pop out in 2.6.16.31. Re: your 16 core machine running 2.6.9... What does /proc/acpi/processor/*/power say? I would expect it to say C1 only. I would not expect this box to grow deeper C-states upon the support above. The only SMP boxes with C-states deeper than C1 that I'm aware of today are laptops. cheers, -Len