From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752157Ab3LMMh0 (ORCPT ); Fri, 13 Dec 2013 07:37:26 -0500 Received: from mail-ie0-f182.google.com ([209.85.223.182]:44381 "EHLO mail-ie0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751872Ab3LMMhY (ORCPT ); Fri, 13 Dec 2013 07:37:24 -0500 Message-ID: <52AAFF89.5080509@gmail.com> Date: Fri, 13 Dec 2013 07:37:29 -0500 From: Austin S Hemmelgarn User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: David Heidelberger , John CC: lkml Subject: Re: [PATCH] expand micro-optimizations in kernel to newer model CPUs References: <1386518000.90452.YahooMailNeo@web140004.mail.bf1.yahoo.com> <864985fbeb1d8148439e25ec01f47a67@ixit.cz> In-Reply-To: <864985fbeb1d8148439e25ec01f47a67@ixit.cz> X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2013-12-09 22:51, David Heidelberger wrote: > Hello, > > this patch is used in Gentoo geek-sources and mptcp-sources (and > probably in lot other kernel sources sets). So, there was lot testing. > > It's not _big_ performance difference, but -mtune=native is nice to have. > It could be great, if this kernel option could be fully utilized without > need of additional patching. This really depends on how you define 'big'. Even a 1% performance increase is significant for a realtime system, and for someone with a cluster of systems, getting even a small improvement in performance on all of the systems could mean a huge increase in effective processing power.