From owner-freebsd-hackers Tue Jul 11 11:40:56 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id LAA00207 for hackers-outgoing; Tue, 11 Jul 1995 11:40:56 -0700 Received: from mail.htp.com (mail.htp.com [199.171.4.2]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id LAA00199 for ; Tue, 11 Jul 1995 11:40:55 -0700 Received: from et.htp.com (et.htp.com [199.171.4.228]) by mail.htp.com (8.6.5/8.6.5) with SMTP id OAA08675 for ; Tue, 11 Jul 1995 14:40:34 -0400 Date: Tue, 11 Jul 1995 14:40:34 -0400 Message-Id: <199507111840.OAA08675@mail.htp.com> X-Sender: dennis@mail.htp.com X-Mailer: Windows Eudora Version 2.0.3 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: freebsd-hackers@freebsd.org From: dennis@et.htp.com (dennis) Subject: Re: Wanted: 100bT EISA ethernet recommendation Sender: hackers-owner@freebsd.org Precedence: bulk >> >> Tom's opinion.... >> > >> >On Tue, 11 Jul 1995, dennis wrote: >> > >> >> The question is, who would build one? EISA cards are too expensive to build >> >> and EISA is too slow for a 100mbs medium. If someone is making them then >> >> I'll bet they have a much bigger marketing dept than engineering. >> > >> > That's wrong. EISA is fast enough for 100mbs ethernet. >> >> It can't be wrong, because any way you slice it its an opinion. Under light >> load anything will work, but under heavy load its nice if your bus >> throughput is greater than the bandwidth. If your EISA card is bus mastering >> it can take over your machine under heavy load. For a workstation, sure, but >> not for a server. And EISA is too expensive for a workstation. >> >> db > >EISA has a bus bandwidth of 33 mega*bytes* per second. > OK. I'll bite. Obviously my spec sheet is old/wrong or I don't get the new math. The orginal EISA spec was 8.3mhz / 32 bits with 4-6 cycle access. This is 88mbs best case with a real expectation of a little better than 60mbs actual xfer capability. The knock on EISA has always been that its not that much faster than ISA so this 32MB/s stuff must be new. db