From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 Date: Mon, 11 Apr 2016 05:04:54 +0200 Message-ID: <1460343894.3682.11.camel@gmail.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> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: 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 In-Reply-To: <1460319890.25336.2.camel@redhat.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Rik van Riel , "Rafael J. Wysocki" , Peter Zijlstra Cc: "Rafael J. Wysocki" , "Rafael J. Wysocki" , LKML , Linux PM list , Doug Smythies 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