Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752939AbcDIH1d (ORCPT ); Sat, 9 Apr 2016 03:27:33 -0400 Received: from mail-wm0-f51.google.com ([74.125.82.51]:37633 "EHLO mail-wm0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751312AbcDIH1b (ORCPT ); Sat, 9 Apr 2016 03:27:31 -0400 Message-ID: <1460186846.3765.168.camel@gmail.com> Subject: Re: [regression] cross core scheduling frequency drop bisected to 0c313cb20732 From: Mike Galbraith To: Doug Smythies Cc: "'Peter Zijlstra'" , "'Rafael J. Wysocki'" , "'LKML'" , "'Linux PM list'" , "'Rik van Riel'" , "'Rafael J. Wysocki'" Date: Sat, 09 Apr 2016 09:27:26 +0200 In-Reply-To: <001e01d1922f$ef219a10$cd64ce30$@net> References: <1460092854.4051.1.camel@gmail.com> <20160408064510.GK3448@twins.programming.kicks-ass.net> <1460098254.5582.17.camel@gmail.com> <2428384.mEkP3EOpsR@vostro.rjw.lan> <001101d191e4$b00602d0$10120870$@net> <001e01d1922f$ef219a10$cd64ce30$@net> 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: 617 Lines: 16 On Sat, 2016-04-09 at 00:17 -0700, Doug Smythies wrote: > I still didn't find the exact same program, but I think I found some > earlier version of the correct test. > > I get (long term average): > Kernel 4.4.0-17: Powersave 3.93 usecs/loop ; Performance 3.93 usecs/loop 0.89 > Kernel 4.5-rc7: Powersave 3.47 usecs/loop ; Performance 3.51 usecs/loop 1.00 > Kernel 4.6-rc1: Powersave 3.84 usecs/loop ; Performance 3.88 usecs/loop 0.90 > > So, similar results (so far, I didn't try reverted yet). I likely see a bit more go missing because I throttle no_hz when idle is being hammered at high frequency. -Mike