Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262390AbVCaBxM (ORCPT ); Wed, 30 Mar 2005 20:53:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262441AbVCaBxM (ORCPT ); Wed, 30 Mar 2005 20:53:12 -0500 Received: from rwcrmhc12.comcast.net ([216.148.227.85]:54680 "EHLO rwcrmhc12.comcast.net") by vger.kernel.org with ESMTP id S262390AbVCaBxJ (ORCPT ); Wed, 30 Mar 2005 20:53:09 -0500 Date: Wed, 30 Mar 2005 17:52:57 -0800 From: "H. J. Lu" To: Pau Aliagas Cc: lkml , Andi Kleen , binutils@sources.redhat.com Subject: Re: i386/x86_64 segment register issuses (Re: PATCH: Fix x86 segment register access) Message-ID: <20050331015257.GB20979@lucon.org> References: <20050330015312.GA27309@lucon.org> <20050330040017.GA29523@lucon.org> <20050330210801.GA15384@lucon.org> <20050331003437.GB19573@lucon.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1019 Lines: 28 On Thu, Mar 31, 2005 at 02:57:57AM +0200, Pau Aliagas wrote: > On Wed, 30 Mar 2005, H. J. Lu wrote: > > >>>That is what the assembler generates, and should have generated, for > >>>"movw %ds,(%eax)" since Nov. 4, 2004. > >> > >>Could this be the reason for the reported slowdown in the last six months? > > > >Can you elaborate? > > There's an unexplained slowdown of kernel 2.6 detailed in this thread: > http://kerneltrap.org/node/4940 > It is dated as "November 13, 2002 - 13:58". The assembler change was made on Nov. 4, 2004. I don't think they are related at all. > I don't want at all to justify it with the change you talk about in gas, > but maybe it is worth to check if it has anything to do with it. The > slowdown happened in this last six months. H.J. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/