From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753352Ab1L0KPE (ORCPT ); Tue, 27 Dec 2011 05:15:04 -0500 Received: from e28smtp01.in.ibm.com ([122.248.162.1]:59332 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752631Ab1L0KPB (ORCPT ); Tue, 27 Dec 2011 05:15:01 -0500 From: Nikunj A Dadhania To: Avi Kivity Cc: Ingo Molnar , peterz@infradead.org, linux-kernel@vger.kernel.org, vatsa@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS In-Reply-To: <4EF99532.3010803@redhat.com> References: <20111219083141.32311.9429.stgit@abhimanyu.in.ibm.com> <20111219112326.GA15090@elte.hu> <87sjke1a53.fsf@abhimanyu.in.ibm.com> <4EF1B85F.7060105@redhat.com> <877h1o9dp7.fsf@linux.vnet.ibm.com> <20111223103620.GD4749@elte.hu> <4EF701C7.9080907@redhat.com> <87vcp4t45p.fsf@linux.vnet.ibm.com> <877h1iu2md.fsf@linux.vnet.ibm.com> <4EF98D29.1080809@redhat.com> <87ty4mic23.fsf@abhimanyu.in.ibm.com> <4EF99532.3010803@redhat.com> User-Agent: Notmuch/0.10.2+70~gf0e0053 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-redhat-linux-gnu) Date: Tue, 27 Dec 2011 15:40:51 +0530 Message-ID: <87obuuiatw.fsf@abhimanyu.in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii x-cbid: 11122710-4790-0000-0000-00000097821B Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 27 Dec 2011 11:51:46 +0200, Avi Kivity wrote: > On 12/27/2011 11:44 AM, Nikunj A Dadhania wrote: > > > > I am seeing a drop of ~44% when setting yield_on_hlt = 0 > > > > > > > > > > A drop of 44% of what? > > > > > records/sec > > > > Ebizzy - 2VM running in parallel, both having gang scheduling enabled. > > > > yield_on_hlt=1 yield_on_hlt=0 > > EbzyRecords/sec 41955.50 23285.00 -44 > > > > > > Interesting, are you overcommitting vcpus? > Yes(1:2). On a 8cpu machine, have 2VMs running, which is 8vcpus each. Regards Nikunj