Date: Wed, 4 Dec 1996 20:04:40 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: phk@critter.tfs.com (Poul-Henning Kamp) Cc: fenner@parc.xerox.com, phk@freefall.freebsd.org, CVS-committers@freefall.freebsd.org, cvs-all@freefall.freebsd.org, cvs-sys@freefall.freebsd.org Subject: Re: cvs commit: src/sys/net if_tun.h Message-ID: <199612041904.UAA12723@labinfo.iet.unipi.it> In-Reply-To: <4197.849725809@critter.tfs.com> from "Poul-Henning Kamp" at Dec 4, 96 07:56:30 pm
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> Sorry I misunderstood then. I thought it was the max allowed, not the > default MTU. > > Yes, this is backing out then. On this topic: the tun device is quite often used for PPP connections, which in turn end up into relatively slow modem lines. An MTU of 1500 perhaps makes compression and link usage a little bit more effective, but at the price of horrible interactive performance: an MTU-sized packet is about 0.5s at 28.8K. Wouldn't a default of 576 (or whatever is used for slip) more appropriate, given the typical use of tun ? The minority of users which use tun for Mbit/s communications are free to modify the MTU to suit their needs, I think defaults should be chosen to suit the majority of cases. Luigi -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________
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