From owner-cvs-sys Fri Mar 3 21:44:48 1995 Return-Path: cvs-sys-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id VAA16159 for cvs-sys-outgoing; Fri, 3 Mar 1995 21:44:48 -0800 Received: from ref.tfs.com (ref.tfs.com [140.145.254.251]) by freefall.cdrom.com (8.6.9/8.6.6) with ESMTP id VAA16153; Fri, 3 Mar 1995 21:44:45 -0800 Received: (from phk@localhost) by ref.tfs.com (8.6.8/8.6.6) id VAA13918; Fri, 3 Mar 1995 21:44:33 -0800 From: Poul-Henning Kamp Message-Id: <199503040544.VAA13918@ref.tfs.com> Subject: Re: cvs commit: src/sys/net if_loop.c To: davidg@Root.COM Date: Fri, 3 Mar 1995 21:44:33 -0800 (PST) Cc: CVS-commiters@freefall.cdrom.com, cvs-sys@freefall.cdrom.com In-Reply-To: <199503040514.VAA00190@corbin.Root.COM> from "David Greenman" at Mar 3, 95 09:14:09 pm Content-Type: text Content-Length: 944 Sender: cvs-sys-owner@freebsd.org Precedence: bulk > >> davidg 95/03/03 20:28:51 > >> > >> Modified: sys/net if_loop.c > >> Log: > >> Reduced loopback MTU to 16k to work around a miriad of problems with it > >> set near or above 32k (likely caused by 16bit signed word overflow). 16k > >> actually (surprizingly) has higher performance than other values I tested. > > > >Probably because it matches our default TCP-window, thus making it possible > >to return to user-space and effectively run in parallel. > > An interesting thought...but I think it's much more complicated than that. A very good candidate for "understatement of the year". The major part of the last year I have tried to get ATM to perform, and I have learned that unless you actually see it on the line, you shouldn't assume anything about what's in a packet. -- Poul-Henning Kamp TRW Financial Systems, Inc. I am Pentium Of Borg. Division is Futile. You WILL be approximated.