From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: [PATCH] report revision 3 of the ACPI/SMBus PIIX4 controller Date: Mon, 14 Jan 2008 11:24:14 -0200 Message-ID: <20080114132414.GA15200@dmt> References: <20080111212655.GA28753@dmt> <87ve5yynuv.fsf@dylle.kalibalik.dk> <20080113142256.GB8166@dmt> <878x2tzpx4.fsf@dylle.kalibalik.dk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , kvm-devel To: Anders Return-path: Content-Disposition: inline In-Reply-To: <878x2tzpx4.fsf-MhEMtRviUwpApvB0Y80ENH9LOBIZ5rWg@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org On Sun, Jan 13, 2008 at 04:49:27PM +0100, Anders wrote: > Marcelo Tosatti writes: > > > On Sun, Jan 13, 2008 at 12:19:20PM +0100, Anders wrote: > > [...] > > >> How do you get that high consumption? What combination of clocks/hz on > >> host/guest are you using? > > > > CONFIG_HZ=250 > > Okay, with nohz=off (in the guest) I also see some higher load. I > didn't try the patch, though. > > > UP guests use TSC as a clocksource by default, and TSC reads won't > > cause a VMExit. > > So for the lightest load (power saving), I should use UP and TSC? Yes. As you note NOHZ also helps dramatically. ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace