From owner-freebsd-stable Tue May 11 9:51:44 1999 Delivered-To: freebsd-stable@freebsd.org Received: from verdi.nethelp.no (verdi.nethelp.no [158.36.41.162]) by hub.freebsd.org (Postfix) with SMTP id 0AB8415DEF for ; Tue, 11 May 1999 09:51:39 -0700 (PDT) (envelope-from sthaug@nethelp.no) Received: (qmail 8449 invoked by uid 1001); 11 May 1999 16:51:37 +0000 (GMT) To: wpaul@skynet.ctr.columbia.edu Cc: dennis.glatting@software-munitions.com, current@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: Anybody actually using gigabit ethernet? From: sthaug@nethelp.no In-Reply-To: Your message of "Tue, 11 May 1999 12:38:23 -0400 (EDT)" References: <199905111638.MAA25952@skynet.ctr.columbia.edu> X-Mailer: Mew version 1.05+ on Emacs 19.34.2 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Tue, 11 May 1999 18:51:37 +0200 Message-ID: <8447.926441497@verdi.nethelp.no> Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > You didn't read what I said. I don't have a gigabit ethernet switch. > I only have cards. Therefore the *only* way I can test the operation > of the driver and adapters is to connect two machines with gigabit > cards back to back with a patch cable. This automatically implies 'using > gb end-to-end.' > > As for corruption due to TCP sequence number wrapping, I don't know > what to tell you. I never noticed such behavior in my tests, but that's > why I'm asking for feedback from other people. The obvious answer to the TCP sequence number problem is RFC 1323. I assume anybody who wants to use gigabit Ethernet over significant distances *will* use RFC 1323, if they are interested in any performance at all. Otherwise the 64 kbyte window will kill you. As for me, I have tested the driver with Netgear cards. Works great here, I got 470 Mbps (effective application to application) with ttcp, running back to back on a PII-350 and a Celeron 300A (overclocked to 337, thus PCI bus clocked at 37.5 Mhz). The limit in my case is clearly the CPU. However I did *not* see any better performance when I turned on jumbo frames. Next I'll put one card in an old PPro-200 and see what I can get from that. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message