From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: KVM performance vs. Xen Date: Thu, 30 Apr 2009 16:59:28 +0300 Message-ID: <49F9AEC0.2060909@redhat.com> References: <49F8672E.5080507@linux.vnet.ibm.com> <49F967AE.4040905@redhat.com> <49F9AB64.20506@codemonkey.ws> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Andrew Theurer , kvm-devel To: Anthony Liguori Return-path: Received: from mx2.redhat.com ([66.187.237.31]:57544 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753837AbZD3N7e (ORCPT ); Thu, 30 Apr 2009 09:59:34 -0400 In-Reply-To: <49F9AB64.20506@codemonkey.ws> Sender: kvm-owner@vger.kernel.org List-ID: Anthony Liguori wrote: > Avi Kivity wrote: >>> >>> 1) I'm seeing about 2.3% in scheduler functions [that I recognize]. >>> Does that seems a bit excessive? >> >> Yes, it is. If there is a lot of I/O, this might be due to the >> thread pool used for I/O. > > This is why I wrote the linux-aio patch. It only reduced CPU > consumption by about 2% although I'm not sure if that's absolute or > relative. Andrew? Was that before or after the entire path was made copyless? -- error compiling committee.c: too many arguments to function