From owner-freebsd-sparc64@FreeBSD.ORG Wed Apr 27 21:50:56 2005 Return-Path: Delivered-To: freebsd-sparc64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0DCDC16A4CE; Wed, 27 Apr 2005 21:50:56 +0000 (GMT) Received: from ford.blinkenlights.nl (ford.blinkenlights.nl [213.204.211.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id A5FCD43D2F; Wed, 27 Apr 2005 21:50:55 +0000 (GMT) (envelope-from sten@blinkenlights.nl) Received: from tea.blinkenlights.nl (tea.blinkenlights.nl [IPv6:2001:960:301:3:a00:20ff:fe85:fa39]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ford.blinkenlights.nl (Postfix) with ESMTP id A948C3F294; Wed, 27 Apr 2005 23:50:54 +0200 (CEST) Received: by tea.blinkenlights.nl (Postfix, from userid 101) id 4D1F118F; Wed, 27 Apr 2005 23:50:54 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by tea.blinkenlights.nl (Postfix) with ESMTP id 48199159; Wed, 27 Apr 2005 23:50:54 +0200 (CEST) Date: Wed, 27 Apr 2005 23:50:54 +0200 (CEST) From: Sten Spans To: Andrew Belashov In-Reply-To: Message-ID: References: <200504271552.j3RFqCgv077122@white.orel.ru> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed cc: glebius@FreeBSD.org cc: freebsd-sparc64@FreeBSD.org Subject: Re: sparc64/80410: netgraph is causing crash with mpd on sparc64 X-BeenThere: freebsd-sparc64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the Sparc List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Apr 2005 21:50:56 -0000 On Wed, 27 Apr 2005, Sten Spans wrote: > On Wed, 27 Apr 2005, Andrew Belashov wrote: > >> >>> Description: >> mpd does not work on FreeBSD/sparc64. Kernel panic with "memory >> address >> not aligned" trap message. >> >>> How-To-Repeat: >> Configure and run mpd for VPN over pptp. After connect to VPN, >> start nmap scanner. Kernel right away crashed. I have coredump: >> > > Finding unaligned ( or rather not 64bit aligned ) mbufs is the > new cool thing, try if_em or if_tap for more fun and games :). > > On a more serious note, the main problem is that l3 protocols > ( ip, ipv6, ipx ) expect their data to be aligned a certain way. > > But newer ethernet cards, complex headers, complex tunneling > tricks, etc often shift contents a few bytes. i386 has no alignment > constraints ( a small speed hit though ) which means that these > problems are often overlooked. > > OpenBSD and NetBSD have quite a few dirty hacks in drivers to > fixup the mess for each driver. Some work has been done with > m_copyup in -CURRENT but the debate is still open on wether > this should be fixed in a general way in l3 protocols, or in > each "ethernet" driver, or even somewhere else entirely. > > HTH HAND http://mail-index.netbsd.org/source-changes/2002/07/01/0001.html After some more thought, this would indeed seem to be the right direction. It would certainly make life for alpha and sparc64 users a lot less painfull. Lets hope it'll make 6.0-RELEASE -- Sten Spans "There is a crack in everything, that's how the light gets in." Leonard Cohen - Anthem