From owner-freebsd-hackers Tue Mar 20 8:29:51 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from et-gw.etinc.com (et-gw.etinc.com [207.252.1.2]) by hub.freebsd.org (Postfix) with ESMTP id 03AE937B718 for ; Tue, 20 Mar 2001 08:29:48 -0800 (PST) (envelope-from dennis@etinc.com) Received: from dbsys.etinc.com (dbsys.etinc.com [207.252.1.18]) by et-gw.etinc.com (8.9.3/8.9.3) with ESMTP id LAA06987 for ; Tue, 20 Mar 2001 11:30:43 GMT (envelope-from dennis@etinc.com) Message-Id: <5.0.0.25.0.20010320114353.03bbc6f0@mail.etinc.com> X-Sender: dennis@mail.etinc.com X-Mailer: QUALCOMM Windows Eudora Version 5.0 Date: Tue, 20 Mar 2001 11:46:15 -0500 To: hackers@FreeBSD.ORG From: Dennis Subject: Re: Routing latency In-Reply-To: <200103200743.IAA94631@info.iet.unipi.it> References: <3AB7077A.543522F0@herbelot.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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