From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263341AbTIWKkx (ORCPT ); Tue, 23 Sep 2003 06:40:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263260AbTIWKkx (ORCPT ); Tue, 23 Sep 2003 06:40:53 -0400 Received: from mail014.syd.optusnet.com.au ([211.29.132.160]:35464 "EHLO mail014.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S261868AbTIWKkv (ORCPT ); Tue, 23 Sep 2003 06:40:51 -0400 From: Peter Chubb MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16240.8965.91289.460763@wombat.chubb.wattle.id.au> Date: Tue, 23 Sep 2003 20:40:05 +1000 To: "David S. Miller" Cc: Benjamin LaHaise , peter@chubb.wattle.id.au, ak@suse.de, iod00d@hp.com, peterc@gelato.unsw.edu.au, linux-ns83820@kvack.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: NS83820 2.6.0-test5 driver seems unstable on IA64 In-Reply-To: <20030922232237.28a5ac4a.davem@redhat.com> References: <16234.33565.64383.838490@wombat.disy.cse.unsw.edu.au> <20030919043847.GA2996@cup.hp.com> <20030919044315.GC7666@wotan.suse.de> <16234.36238.848366.753588@wombat.chubb.wattle.id.au> <20030919055304.GE16928@wotan.suse.de> <20030919064922.B3783@kvack.org> <16239.38154.969505.748461@wombat.chubb.wattle.id.au> <20030922203629.B21836@kvack.org> <20030922232237.28a5ac4a.davem@redhat.com> X-Mailer: VM 7.14 under 21.4 (patch 13) "Rational FORTRAN" XEmacs Lucid Comments: Hyperbole mail buttons accepted, v04.18. X-Face: GgFg(Z>fx((4\32hvXq<)|jndSniCH~~$D)Ka:P@e@JR1P%Vr}EwUdfwf-4j\rUs#JR{'h# !]])6%Jh~b$VA|ALhnpPiHu[-x~@<"@Iv&|%R)Fq[[,(&Z'O)Q)xCqe1\M[F8#9l8~}#u$S$Rm`S9% \'T@`:&8>Sb*c5d'=eDYI&GF`+t[LfDH="MP5rwOO]w>ALi7'=QJHz&y&C&TE_3j! Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "David" == David S Miller writes: David> On Mon, 22 Sep 2003 20:36:29 -0400 Benjamin LaHaise David> wrote: >> Denied. Dave, please explain. David> Why should I have anything to explain? :-) David> The fact that ia64 is doing a printk for an unaligned kernel David> load or store is what you should be asking questions about :) How expensive is it to take the trap and do a fix up, compared to making an aligned copy? As it involves raising and handling a fault disassembling the instruction that caused the fault, etc., I'd be surprised if it's much less than 1000 cycles, even without the printk, although I haven't measured it yet, and can't find enough info in the architecture manuals to know what it is. Even if it's only 500 cycles, you can copy and realign a large packet in that time. -- Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au You are lost in a maze of BitKeeper repositories, all slightly different.