From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752531AbbBVM5m (ORCPT ); Sun, 22 Feb 2015 07:57:42 -0500 Received: from mail-we0-f171.google.com ([74.125.82.171]:39937 "EHLO mail-we0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752145AbbBVM5l (ORCPT ); Sun, 22 Feb 2015 07:57:41 -0500 Date: Sun, 22 Feb 2015 13:57:36 +0100 From: Ingo Molnar To: Borislav Petkov Cc: Andy Lutomirski , Oleg Nesterov , Rik van Riel , x86@kernel.org, linux-kernel@vger.kernel.org, Linus Torvalds , Arjan van de Ven Subject: Re: [RFC PATCH] x86, fpu: Use eagerfpu by default on all CPUs Message-ID: <20150222125736.GA25667@gmail.com> References: <20150221093150.GA27841@gmail.com> <20150221163840.GA32073@pd.tnic> <20150221172914.GB32073@pd.tnic> <20150221183952.GD8406@gmail.com> <20150221191527.GC32073@pd.tnic> <20150221192352.GA10027@gmail.com> <20150221213625.GD32073@pd.tnic> <20150222081840.GA22972@gmail.com> <20150222125023.GC7529@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150222125023.GC7529@pd.tnic> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Borislav Petkov wrote: > Lazy FPU: > 219.406449195 seconds time elapsed ( +- 0.17% ) > Eager FPU: > 218.791122148 seconds time elapsed ( +- 0.13% ) > Timing improvement of 0.6 secs on average looks nice to > me. Next I'll do the same thing in tmpfs to see how the > numbers look without the page cache. This is also very similar to the ~0.6 secs improvement your first set of numbers gave. So now that it appears we have consistent numbers, it would be nice to check it on older hardware (and other workloads) as well, to see whether it's a consistent win. Thanks, Ingo