From owner-freebsd-current Mon Feb 2 09:59:17 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA01643 for current-outgoing; Mon, 2 Feb 1998 09:59:17 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from sendero.simon-shapiro.org (sendero-fxp0.Simon-Shapiro.ORG [206.190.148.34]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id JAA01598 for ; Mon, 2 Feb 1998 09:59:14 -0800 (PST) (envelope-from shimon@sendero-fxp0.simon-shapiro.org) Received: (qmail 24849 invoked by uid 1000); 30 Jan 1998 23:57:47 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-012698 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Fri, 30 Jan 1998 15:57:47 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Jaye Mathisen Subject: Re: -current, goliath, smp -- problems Cc: current , Steve Passe , Alex , Jason Evans Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG X-To-Unsubscribe: mail to majordomo@FreeBSD.org "unsubscribe current" On 11-Dec-97 Jaye Mathisen wrote: > > > On Tue, 9 Dec 1997, Jason Evans wrote: > >> On Mon, 8 Dec 1997, Alex wrote: >> in the neighborhood of 500 MB/sec, which is enough to feed 4 processors, >> but quite inadequate for 8. So, even though there are twice as many >> processors, the performance gain is not impressive. >> >> If there's anyone else out there that knows any better, please correct >> me. >> =) > > While I can't correct you, I have a couple DEC ZX6000's, that when using > the add-on memory boards, so there's something like 4GB of SIMMS, the > memory path becomes 256bit wide, 4 way interleaved, and runs at some > hellacious rate, and I remember the memory bandwidth being significantly > higher than 500MB/s. A number I remember for the P6 bus is 562MB/Sec, as far as the P6 bus is converned. Regardless of the DRAM memory bus itself. > > Heck, if somebody knows of some memory benchmarking software, I'd be > happy > to try it out. > ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313