From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754828AbbCFPEa (ORCPT ); Fri, 6 Mar 2015 10:04:30 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:42429 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754011AbbCFPE2 (ORCPT ); Fri, 6 Mar 2015 10:04:28 -0500 Message-ID: <54F9C1DE.9030501@oracle.com> Date: Fri, 06 Mar 2015 08:03:58 -0700 From: David Ahern User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Peter Zijlstra CC: Mike Galbraith , Ingo Molnar , LKML Subject: Re: NMI watchdog triggering during load_balance References: <54F92788.6010007@oracle.com> <20150306085121.GX21418@twins.programming.kicks-ass.net> In-Reply-To: <20150306085121.GX21418@twins.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/6/15 1:51 AM, Peter Zijlstra wrote: > On Thu, Mar 05, 2015 at 09:05:28PM -0700, David Ahern wrote: >> Hi Peter/Mike/Ingo: >> >> Does that make sense or am I off in the weeds? > > How much of your story pertains to 3.18? I'm not particularly interested > in anything much older than that. > No. All of the data in the opening email are from 2.6.39. Each kernel (2.6.39, 3.8 and 3.18) has a different performance problem. I will look at 3.18 in depth soon, but from what I can see the fundamental concepts of the load balancing have not changed (e.g., my tracepoints from 2.6.39 still apply to 3.18). David