From owner-freebsd-hackers Tue Jun 1 10:58:14 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from news.IAEhv.nl (news.IAE.nl [194.151.64.4]) by hub.freebsd.org (Postfix) with ESMTP id 18B8215181 for ; Tue, 1 Jun 1999 10:58:10 -0700 (PDT) (envelope-from marc@bowtie.nl) Received: (from uucp@localhost) by news.IAEhv.nl (8.9.1/8.9.1) with IAEhv.nl id TAA21548; Tue, 1 Jun 1999 19:50:06 +0200 (MET DST) Received: from localhost (localhost [127.0.0.1]) by bowtie.nl (8.8.8/8.8.8) with ESMTP id TAA04237; Tue, 1 Jun 1999 19:46:46 +0200 (CEST) (envelope-from marc@bowtie.nl) Message-Id: <199906011746.TAA04237@bowtie.nl> X-Mailer: exmh version 2.0.2 2/24/98 To: Peter Edwards Cc: hackers@FreeBSD.ORG Subject: Re: xl driver for 3Com In-reply-to: peter.edwards's message of Tue, 01 Jun 1999 18:17:24 +0100. <375415A4.33FB232E@isocor.ie> Reply-To: marc@bowtie.nl Date: Tue, 01 Jun 1999 19:46:45 +0200 From: Marc van Kempen Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Dennis wrote: > > > For "Fairness" gaps in between frames are better > > as you approach capacity of your wire. > > Isn't there some ethernet requirement (implemented on the NIC) that a > transmitter holds off the wire a little to give other NICs enough time > to notice there's nothing being transmitted? > > The sequence of events would be something like: > > NIC1 NIC2 time | > v > start xmit > host queues next packet > xmit finishes > start "back-to-back" delay > sense idle wire > start xmit > sense access from NIC2 > "back-to-back" delay ends > wait for wire idle > xmit finishes > sense idle > start xmit > > No, only when there is a collision, both sides then wait a random amount of time before trying again. Marc. ---------------------------------------------------- Marc van Kempen BowTie Technology Email: marc@bowtie.nl WWW & Databases tel. +31 40 2 43 20 65 fax. +31 40 2 44 21 86 http://www.bowtie.nl ---------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message