Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262433AbTIVTJo (ORCPT ); Mon, 22 Sep 2003 15:09:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262712AbTIVTJo (ORCPT ); Mon, 22 Sep 2003 15:09:44 -0400 Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:45117 "EHLO ebiederm.dsl.xmission.com") by vger.kernel.org with ESMTP id S262433AbTIVTJn (ORCPT ); Mon, 22 Sep 2003 15:09:43 -0400 To: Jamie Lokier Cc: Arjan van de Ven , Alan Cox , Linux Kernel Mailing List Subject: Re: Can we kill f inb_p, outb_p and other random I/O on port 0x80, in 2.6? References: <1064229778.8584.2.camel@dhcp23.swansea.linux.org.uk> <20030922162602.GB27209@mail.jlokier.co.uk> <1064248391.8895.6.camel@dhcp23.swansea.linux.org.uk> <1064250691.6235.2.camel@laptop.fenrus.com> <20030922182808.GA28372@mail.jlokier.co.uk> From: ebiederm@xmission.com (Eric W. Biederman) Date: 22 Sep 2003 13:09:18 -0600 In-Reply-To: <20030922182808.GA28372@mail.jlokier.co.uk> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 771 Lines: 20 Jamie Lokier writes: > Arjan van de Ven wrote: > > The first person to complain about the extra branch miss in udelay for > > this will get laughed at by me ;) > > udelay(1) is too slow on a 386 even without the branch miss. Hmm. I will have to test that one. > If you think I/O operations are infinitely slower than other > instructions, please explain why there is asm-optimised I/O code in > asm-i386/floppy.h. > > :) Because the kernel was initially written in assembly and then fixed? Eric - 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/