From owner-freebsd-hackers Sat Mar 13 21:26: 5 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from obie.softweyr.com (unknown [204.68.178.33]) by hub.freebsd.org (Postfix) with ESMTP id 67B3314FD9 for ; Sat, 13 Mar 1999 21:25:45 -0800 (PST) (envelope-from wes@softweyr.com) Received: from softweyr.com (wes@zaphod.softweyr.com [204.68.178.35]) by obie.softweyr.com (8.8.8/8.8.8) with ESMTP id WAA08448; Sat, 13 Mar 1999 22:25:00 -0700 (MST) (envelope-from wes@softweyr.com) Message-ID: <36EB482B.14BD236@softweyr.com> Date: Sat, 13 Mar 1999 22:24:59 -0700 From: Wes Peters Organization: Softweyr llc X-Mailer: Mozilla 4.5 [en] (X11; U; FreeBSD 3.1-RELEASE i386) X-Accept-Language: en MIME-Version: 1.0 To: Amancio Hasty Cc: Cory Kempf , Bill Paul , freebsd-hackers@FreeBSD.ORG Subject: Re: Gigabit ethernet -- what am I doing wrong? References: <199903140500.VAA73230@rah.star-gate.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Amancio Hasty wrote: > > > 200 Mb/s = 25 MB/s, which seems a little low, but is within the realm of > > what I would expect. > > I think the system should be able to support at least 70MB/s at least I do over here > with a bt848 video capture board capturing 640x480x4 at 30 frames per second > and then displaying the frames on video display card 8) An article in IEEE Computer magazine last summer reported achieving 320 Mb/s throughput with Myricom Myrinet boards on FreeBSD. I've seen this number batted around industry publications like Network World a number of times also. That would seem to require only a 10 Mhz clock with a 32-bit bus bandwidth; is there really this much overhead in the PCI transactions? -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC http://www.softweyr.com/~softweyr wes@softweyr.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message