From owner-freebsd-hackers Sun Feb 21 15: 5:42 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from alpo.whistle.com (alpo.whistle.com [207.76.204.38]) by hub.freebsd.org (Postfix) with ESMTP id 9FFD310F4D for ; Sun, 21 Feb 1999 15:05:39 -0800 (PST) (envelope-from julian@whistle.com) Received: (from daemon@localhost) by alpo.whistle.com (8.8.5/8.8.5) id OAA20749; Sun, 21 Feb 1999 14:59:56 -0800 (PST) Received: from s204m82.isp.whistle.com(207.76.204.82) via SMTP by alpo.whistle.com, id smtpdD20747; Sun Feb 21 22:59:51 1999 Date: Sun, 21 Feb 1999 14:59:30 -0800 (PST) From: Julian Elischer X-Sender: julian@s204m82.isp.whistle.com To: David Greenman Cc: Luigi Rizzo , wpaul@skynet.ctr.columbia.edu, hackers@FreeBSD.ORG Subject: Re: How to handle jumbo etherney frames In-Reply-To: <199902211235.EAA12927@implode.root.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG no, we ised to use 15.5KB (k byte) frames on a project (I believe the ifdefs may still be in the if_de driver). We also had other machines on that net. At one time SUNS would crash but that problem went away. I presume that the jumbo packets are only sent between machines that support them.. On Sun, 21 Feb 1999, David Greenman wrote: > >> The jumbo frames are only useful if you also have VLAN support, which we > >> don't have currently. We also need support for large mbuf clusters; this > > > >hmmm i don't get this -- why is this related to VLAN ? > > Because most ethernets consist of a mix of hosts that don't have jumbo > frame capability. If you use jumbo frames without VLANs, then ALL hosts must > support jumbo frames (and I think would also have to be gigabit ethernet > connected since jumbo frames weren't supported in 802.3...although I'm > assuming that the gigabit spec allows for jumbo frames, which may be a > bad assumption on my part). > > -DG > > David Greenman > Co-founder/Principal Architect, The FreeBSD Project > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message