From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753901Ab2BORia (ORCPT ); Wed, 15 Feb 2012 12:38:30 -0500 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:53826 "EHLO e23smtp08.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753777Ab2BORi3 (ORCPT ); Wed, 15 Feb 2012 12:38:29 -0500 Date: Wed, 15 Feb 2012 23:08:17 +0530 From: Srivatsa Vaddagiri To: Peter Zijlstra Cc: mingo@elte.hu, pjt@google.com, efault@gmx.de, venki@google.com, suresh.b.siddha@intel.com, linux-kernel@vger.kernel.org, "Nikunj A. Dadhania" Subject: Re: sched: Performance of Trade workload running inside VM Message-ID: <20120215173817.GD9918@linux.vnet.ibm.com> Reply-To: Srivatsa Vaddagiri References: <20120214112827.GA22653@linux.vnet.ibm.com> <1329307161.2293.66.camel@twins> <20120215171032.GB9918@linux.vnet.ibm.com> <1329326651.2293.151.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <1329326651.2293.151.camel@twins> User-Agent: Mutt/1.5.21 (2010-09-15) x-cbid: 12021507-5140-0000-0000-000000C06938 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Peter Zijlstra [2012-02-15 18:24:11]: > On Wed, 2012-02-15 at 22:40 +0530, Srivatsa Vaddagiri wrote: > > Ok ..let me see if these numbers highlight the problem better. > > does this translate like: I've no fscking clue, I'd mentioned a possible reason earlier which is limiting VM1 to reach higher utilization (which is the time it waits for cpu after wakeup): >b. In the "all VMs active" case, VM1's vcpu tasks were found to incur > "high" wait times when ttwo of VM1's tasks were scheduled on the same > CPU (i.e a VCPU task had to wait behind a sibling VCPU task for > obtaining CPU resource). Let me get cpu wait time data and post it by tomorrow. > but my tinker made it go away? Do you have any other suggestions for me to try? - vatsa