From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753931AbdEEN2y (ORCPT ); Fri, 5 May 2017 09:28:54 -0400 Received: from mail-qk0-f195.google.com ([209.85.220.195]:33464 "EHLO mail-qk0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751837AbdEEN2x (ORCPT ); Fri, 5 May 2017 09:28:53 -0400 Date: Fri, 5 May 2017 09:28:45 -0400 From: Tejun Heo To: Vincent Guittot Cc: Ingo Molnar , Peter Zijlstra , linux-kernel , Linus Torvalds , Mike Galbraith , Paul Turner , Chris Mason , kernel-team@fb.com Subject: Re: [RFC PATCHSET v2] sched/fair: fix load balancer behavior when cgroup is in use Message-ID: <20170505132845.GC8936@wtj.duckdns.org> References: <20170504202838.GA2647@htj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.8.0 (2017-02-23) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, Vincent. On Fri, May 05, 2017 at 10:46:53AM +0200, Vincent Guittot wrote: > schbench results looks better with this version > Latency percentiles (usec) > 50.0000th: 212 > 75.0000th: 292 > 90.0000th: 385 > 95.0000th: 439 > *99.0000th: 671 > 99.5000th: 7992 > 99.9000th: 12176 > min=0, max=14855 > > p99 is back to a normal value but p99.5 stays higher than mainline By how much and is that with the weight adjustment on the cgroup? I can't get reliable numbers on p99.5 and beyond on my test setup. I ordered the hikey board and will try to replicate your setup once it arrives. > I have also checked load_avg and runnable_load_avg value and there is > something incorrect. I will provide details on the related patch Sure, will respond there. Thanks. -- tejun