From mboxrd@z Thu Jan 1 00:00:00 1970 From: Raghavendra K T Subject: Re: [PATCH V2 RFC 3/3] kvm: Check system load and handle different commit cases accordingly Date: Wed, 31 Oct 2012 11:40:37 +0530 Message-ID: <5090C0DD.4070505@linux.vnet.ibm.com> References: <20121029140621.15448.92083.sendpatchset@codeblue> <20121029140717.15448.83182.sendpatchset@codeblue> <1351533280.24721.46.camel@twins> <508F6C60.1050202@linux.vnet.ibm.com> <1351584858.4047.32.camel@twins> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: "H. Peter Anvin" , Avi Kivity , Ingo Molnar , Marcelo Tosatti , Rik van Riel , Srikar , "Nikunj A. Dadhania" , KVM , Jiannan Ouyang , Chegu Vinod , "Andrew M. Theurer" , LKML , Srivatsa Vaddagiri , Gleb Natapov , Andrew Jones To: Peter Zijlstra Return-path: Received: from e28smtp06.in.ibm.com ([122.248.162.6]:44949 "EHLO e28smtp06.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750899Ab2JaGPU (ORCPT ); Wed, 31 Oct 2012 02:15:20 -0400 Received: from /spool/local by e28smtp06.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 31 Oct 2012 11:45:16 +0530 In-Reply-To: <1351584858.4047.32.camel@twins> Sender: kvm-owner@vger.kernel.org List-ID: On 10/30/2012 01:44 PM, Peter Zijlstra wrote: > On Tue, 2012-10-30 at 11:27 +0530, Raghavendra K T wrote: >> Okay, now IIUC, usage of *any* global measure is bad? > > Yep, people like to carve up their machines, esp. now that they're > somewhat bigger than they used to be. This can result in very asymmetric > loads, no global measure can ever deal with that. Thanks for explaining the concerns. Very True and if load is very asymmetric due to power optimization etc constraints. This may affect.