Date: Tue, 01 Jun 1999 19:46:45 +0200 From: Marc van Kempen <marc@bowtie.nl> To: Peter Edwards <peter.edwards@isocor.ie> Cc: hackers@FreeBSD.ORG Subject: Re: xl driver for 3Com Message-ID: <199906011746.TAA04237@bowtie.nl> In-Reply-To: peter.edwards's message of Tue, 01 Jun 1999 18:17:24 %2B0100. <375415A4.33FB232E@isocor.ie>
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> 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
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