From owner-freebsd-stable Tue May 1 21:23:29 2001 Delivered-To: freebsd-stable@freebsd.org Received: from posgate.acis.com.au (posgate.acis.com.au [203.14.230.14]) by hub.freebsd.org (Postfix) with ESMTP id 0E23137B423 for ; Tue, 1 May 2001 21:23:26 -0700 (PDT) (envelope-from andymac@bullseye.apana.org.au) Received: from bullseye.apana.org.au (dialup-3.aaa.net.au [203.14.230.68]) by posgate.acis.com.au (8.11.3/8.11.3) with ESMTP id f424NHI25665; Wed, 2 May 2001 14:23:20 +1000 Received: from bullseye.apana.org.au (central-f.apana.org.au [203.9.107.235]) by bullseye.apana.org.au (8.8.8/8.8.8) with ESMTP id MAA01303; Wed, 2 May 2001 12:07:22 +1000 (EST) (envelope-from andymac@bullseye.apana.org.au) Date: Wed, 2 May 2001 12:02:06 +1000 (EST) From: Andrew MacIntyre To: John Merryweather Cooper Cc: FreeBSD-STABLE Mailing List Subject: Re: problem with plip stealing clock In-Reply-To: <3AEED69E.F6EC1EAD@webmail.bmi.net> Message-ID: X-X-Sender: andymac@bullseye.apana.org.au MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, 1 May 2001, John Merryweather Cooper wrote: > > I did have the problem with PLIP between my 386 laptop and 486 desktop > > until I reduced the MTU to 512. > > Anything "magical" about 512 (or is lower better here). If lower is > better, how low can I go (I guess I'll find out). You seek a compromise: lower the MTU until your time loss problem goes away, but not much lower as the overhead in packet reassembly becomes more significant as MTU is lowered. I don't know what the actual minimum is, but IIRC MTU < ~128 bytes doesn't usually achieve much. I'd start at the MTU=512 Jeremy suggested. -- Andrew I MacIntyre "These thoughts are mine alone..." E-mail: andrew.macintyre@aba.gov.au (work) | Snail: PO Box 370 andymac@bullseye.apana.org.au (play) | Belconnen ACT 2616 andymac@pcug.org.au (play2) | Australia To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message