From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 2 May 2001 06:53:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 2 May 2001 06:53:03 -0400 Received: from ns.suse.de ([213.95.15.193]:7685 "HELO Cantor.suse.de") by vger.kernel.org with SMTP id ; Wed, 2 May 2001 06:52:51 -0400 Date: Wed, 2 May 2001 12:52:43 +0200 From: Andi Kleen To: Richard Gooch Cc: Andi Kleen , Ingo Molnar , Ville Herva , Fabio Riccardi , linux-kernel@vger.kernel.org Subject: Re: X15 alpha release: as fast as TUX but in user space (fwd) Message-ID: <20010502125243.A518@gruyere.muc.suse.de> In-Reply-To: <20010428215301.A1052@gruyere.muc.suse.de> <200104282256.f3SMuRW15999@vindaloo.ras.ucalgary.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <200104282256.f3SMuRW15999@vindaloo.ras.ucalgary.ca>; from rgooch@ras.ucalgary.ca on Sat, Apr 28, 2001 at 04:56:27PM -0600 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org [sorry for the late answer -- i was involuntarily offline for a few days] On Sat, Apr 28, 2001 at 04:56:27PM -0600, Richard Gooch wrote: > Whatever happened to that hack that was discussed a year or two ago? > The one where (also on IA32) a magic page was set up by the kernel > containing code for fast system calls, and the kernel would write > calibation information to that magic page. The code written there > would use the TSC in conjunction with that calibration data. > > There was much discussion about this idea, even Linus was keen on > it. But IIRC, nothing ever happened. It's already implemented in the x86-64 port, thanks to Andrea Arcangelli. -Andi