From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: XEN increases idle power consumption by 25% Date: Wed, 24 Aug 2011 18:25:28 -0400 Message-ID: <20110824222528.GA4653@dumpdata.com> References: <4E5518EF0200007800052EC6@nat28.tlf.novell.com> <4E5551ED.9090704@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4E5551ED.9090704@goop.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jeremy Fitzhardinge Cc: Martin Meier , xen-devel@lists.xensource.com, Jan Beulich List-Id: xen-devel@lists.xenproject.org On Wed, Aug 24, 2011 at 12:33:01PM -0700, Jeremy Fitzhardinge wrote: > 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 Um, from the same kernel to the same kernel? > >> 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? And you can test the xen-cpu-idle patches in #testing if you are up for seeing if that is the cause of your power consumption issues. git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git #testing specifically. > > J > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel