Date: Tue, 20 Mar 2001 11:46:15 -0500 From: Dennis <dennis@etinc.com> To: hackers@FreeBSD.ORG Subject: Re: Routing latency Message-ID: <5.0.0.25.0.20010320114353.03bbc6f0@mail.etinc.com> In-Reply-To: <200103200743.IAA94631@info.iet.unipi.it> References: <3AB7077A.543522F0@herbelot.com>
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At 02:43 AM 03/20/2001, you wrote: > > > I'm using the de driver. Alas, the NICs seems quite old. They are > 21140's. > > > I've only got one 21143. I think there is a 3COM 3c905b in the lab too. > > > Would it be better to use the 21143 + 3com than two 21140s? > > > > definitely : in my packet blaster, I get an order of magnitude less > > packet drops with a 3c905 than with a dc NIC (which is on a multi-port > > NIC : the PCI-PCI bridge may be a hindrance there) > >not my experience -- with the 21143 i can blast 140kpacket/s >and receive them with no problems. >For sure the "de" driver might have its own problems, >but i think a lot of packet drops also depend on the card >not being properly set for full duplex (which can >cause collisions and lots of drops). You should initially test mono-directional in a controlled environment to avoid "collisions" to compare the true efficiency of the driver. dennis To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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