From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: Problem with shared L2 cache Date: Fri, 22 Jan 2010 17:32:18 +0200 Message-ID: <20100122153218.GN2076@redhat.com> References: <4e2ada971001220631u3bcf0f45ycc0d4723c2dd277c@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: Hristo Tomov Return-path: Received: from mx1.redhat.com ([209.132.183.28]:6272 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754879Ab0AVPcV (ORCPT ); Fri, 22 Jan 2010 10:32:21 -0500 Content-Disposition: inline In-Reply-To: <4e2ada971001220631u3bcf0f45ycc0d4723c2dd277c@mail.gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: On Fri, Jan 22, 2010 at 04:31:50PM +0200, Hristo Tomov wrote: > Hello! > > I have following problem with KVM. I have quad-core processor > Xeon X7350 ( 8MB L2 cache ). The processor shares 4 MB L2 cache on two > cores. By XEN emulation the guest system have 4 MB cache at disposal. > Cache information is meaningless in virtual environment. Your performance problem lies somewhere else. Trying -cpu host is a good idea nevertheless. -- Gleb.