From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: XEN increases idle power consumption by 25% Date: Wed, 24 Aug 2011 12:33:01 -0700 Message-ID: <4E5551ED.9090704@goop.org> References: <4E5518EF0200007800052EC6@nat28.tlf.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4E5518EF0200007800052EC6@nat28.tlf.novell.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jan Beulich Cc: Martin Meier , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org On 08/24/2011 06:29 AM, Jan Beulich wrote: >>>> On 24.08.11 at 14:03, Martin Meier wrote: >> Hi, >> >> I'm seeing a change in AC idle power consumption from ~23W to ~29W >> when changing form 3.1-rc2 to 3.1-rc2 on top of xen-4.2-unstable with no >> domUs running. >> >> It seems that the CPU never gets into the low power idle state for the whole >> CPU-package 'PC6' >> and the Vcore voltage never gets below +1.06 V (It get down to 0.7V w/o >> xen). > This has been discussed recently; see e.g. the thread starting at > http://lists.xensource.com/archives/html/xen-devel/2011-08/msg00511.html. Also, upstream Linux doesn't have the patches to pass the power state stuff through to Xen, which I guess it part of it? J