Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753689AbdGJIrF (ORCPT ); Mon, 10 Jul 2017 04:47:05 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:34064 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752714AbdGJIrD (ORCPT ); Mon, 10 Jul 2017 04:47:03 -0400 Date: Mon, 10 Jul 2017 10:46:47 +0200 From: Peter Zijlstra To: Aubrey Li Cc: tglx@linutronix.de, len.brown@intel.com, rjw@rjwysocki.net, ak@linux.intel.com, tim.c.chen@linux.intel.com, arjan@linux.intel.com, paulmck@linux.vnet.ibm.com, yang.zhang.wz@gmail.com, x86@kernel.org, linux-kernel@vger.kernel.org, Aubrey Li Subject: Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods Message-ID: <20170710084647.zs6wkl3fumszd33g@hirez.programming.kicks-ass.net> References: <1499650721-5928-1-git-send-email-aubrey.li@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1499650721-5928-1-git-send-email-aubrey.li@intel.com> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 343 Lines: 9 On Mon, Jul 10, 2017 at 09:38:30AM +0800, Aubrey Li wrote: > We measured 3%~5% improvemnt in disk IO workload, and 8%~20% improvement in > network workload. Argh, what a mess :/ So how much of the gain is simply due to skipping NOHZ? Mike used to carry a patch that would throttle NOHZ. And that is a _far_ smaller and simpler patch to do.