Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751353AbdGREpZ (ORCPT ); Tue, 18 Jul 2017 00:45:25 -0400 Received: from mga04.intel.com ([192.55.52.120]:56789 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750931AbdGREpY (ORCPT ); Tue, 18 Jul 2017 00:45:24 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.40,376,1496127600"; d="scan'208";a="112482686" Date: Mon, 17 Jul 2017 21:45:21 -0700 From: Andi Kleen To: "Li, Aubrey" Cc: Peter Zijlstra , Frederic Weisbecker , Christoph Lameter , Aubrey Li , tglx@linutronix.de, len.brown@intel.com, rjw@rjwysocki.net, 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, daniel.lezcano@linaro.org Subject: Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods Message-ID: <20170718044521.GO3441@tassilo.jf.intel.com> References: <20170713145311.z4zxlyd2dospeoqg@hirez.programming.kicks-ass.net> <4a577bd6-20b1-abb6-2153-f9870f0a721e@linux.intel.com> <20170713182820.sn3fjitnd3mca27p@hirez.programming.kicks-ass.net> <31170ac6-9db1-f0b8-4841-f1661c8ed6e1@linux.intel.com> <20170714153818.pjauqxebxyhs6ljp@hirez.programming.kicks-ass.net> <20170714155356.GH3441@tassilo.jf.intel.com> <20170714160648.tg2u6eo2id6gmnjz@hirez.programming.kicks-ass.net> <20170714162619.GJ3441@tassilo.jf.intel.com> <20170717192309.ubn5muvc3u7htuaw@hirez.programming.kicks-ass.net> <34371ef8-b8bc-d2bf-93de-3fccd6beb032@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <34371ef8-b8bc-d2bf-93de-3fccd6beb032@linux.intel.com> 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 Content-Length: 322 Lines: 9 > We need a tradeoff here IMHO. I'll check Daniel's work to understand how/if > it's better than menu governor. I still would like to see how the fast path without the C1 heuristic works. Fast pathing is a different concept from a better predictor. IMHO we need both, but the first is likely lower hanging fruit. -Andi