From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [RFC] fix VMX TSC synchronicity Date: Sun, 20 Jan 2008 16:59:26 +0200 Message-ID: <479361CE.4020003@qumranet.com> References: <478A01D1.7000402@qumranet.com> <20080114160647.GA15919@dmt> <478CC448.1030901@qumranet.com> <478CC819.3040106@csgraf.de> <478CCCA9.2080300@qumranet.com> <478DC453.1000404@qumranet.com> <20080116133454.GA14481@one.firstfloor.org> <478E08E5.2030507@qumranet.com> <20080116135415.GA14664@one.firstfloor.org> <20080117184349.GA17843@dmt> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel , Alexander Graf , Andi Kleen To: Marcelo Tosatti Return-path: In-Reply-To: <20080117184349.GA17843@dmt> 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 Marcelo Tosatti wrote: > Avi, do you understand why C3 was causing the Windows SMP problems ? > > It may be that the latency was advertised as so low that Windows switched into C3 and back too often. Also, the problem possibly wasn't SMP related but rather TPR related -- when the idle loop called acpi to do the mode switches, that caused many tpr hits. Perhaps with a FlexPriority enabled processor it would work better. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/