Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751651AbcDKDFA (ORCPT ); Sun, 10 Apr 2016 23:05:00 -0400 Received: from mail-wm0-f51.google.com ([74.125.82.51]:33505 "EHLO mail-wm0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751094AbcDKDE6 (ORCPT ); Sun, 10 Apr 2016 23:04:58 -0400 Message-ID: <1460343894.3682.11.camel@gmail.com> Subject: Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 From: Mike Galbraith To: Rik van Riel , "Rafael J. Wysocki" , Peter Zijlstra Cc: "Rafael J. Wysocki" , "Rafael J. Wysocki" , LKML , Linux PM list , Doug Smythies Date: Mon, 11 Apr 2016 05:04:54 +0200 In-Reply-To: <1460319890.25336.2.camel@redhat.com> References: <1460092854.4051.1.camel@gmail.com> <20160408064510.GK3448@twins.programming.kicks-ass.net> <1460098254.5582.17.camel@gmail.com> <2428384.mEkP3EOpsR@vostro.rjw.lan> <20160409110729.GS3448@twins.programming.kicks-ass.net> <1460302797.4383.44.camel@gmail.com> <1460319890.25336.2.camel@redhat.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 658 Lines: 17 On Sun, 2016-04-10 at 16:24 -0400, Rik van Riel wrote: > On Sun, 2016-04-10 at 17:39 +0200, Mike Galbraith wrote: > > Should the default idle state not then be governor dependent? When I > > set gov=performance, I'm expecting box to go just as fast as it can > > go > > without melting. Does polling risk CPU -> lava conversion? > > Current CPUs can only have some cores run at full speed > (turbo mode) if other cores are idling and/or running at > lower speeds. The real world is very unlikely to miss the prettier numbers I'm grieving over one tiny bit. Knowing that doesn't make giving them up any easier though.. byebye cycles (sniff) ;-) -Mike