From owner-freebsd-hackers Sun Mar 21 20:24: 6 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 F379714FE6 for ; Sun, 21 Mar 1999 20:24:01 -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 VAA29164; Sun, 21 Mar 1999 21:21:53 -0700 (MST) (envelope-from wes@softweyr.com) Message-ID: <36F5C560.462546F4@softweyr.com> Date: Sun, 21 Mar 1999 21:21:52 -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: Mike Smith Cc: Dennis , Amancio Hasty , hackers@FreeBSD.ORG Subject: Re: Gigabit ethernet -- what am I doing wrong? References: <199903220200.SAA02330@dingo.cdrom.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Mike Smith wrote: > > > At 12:13 PM 3/21/99 -0800, you wrote: > > > > > >Hmm.... > > >Does anyone know when the faster PCI busses (64bits or 66MHz PCI clock rate) > > >are going to be availabe ? > > > > The "availability" of 66Mhz busses is almost moot. Making ASICs work at 33mhz > > is a chore....66mhz is a waze off. > > That's close, but several of the major ASIC vendors were (or were > claiming to be) sampling devices with 66MHz PCI macrocells the last time > I looked. I guess our 80 Mhz ASICs are a bit of an oddity then? > > And as far a 64 bit busses.....there > > arent many > > processors that can do is, and doubling the bandwidth on a 32bit processor > > isnt > > always linear in performance. You have to get a whole new generation of > > processors before you will see any usable products. > > This has nothing whatever to do with reality, however. Most PCI > peripherals are bus masters, and most memory busses these days are at > least 64 bits wide, so 64 bit PCI has very real performance benefits. > > The processor's internal word size has little or nothing to do with the > equation. Especially when the processor doesn't get particularly involved in the process, like in the case of sendfile(). -- "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