From owner-freebsd-current Thu Dec 11 00:12:59 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id AAA15862 for current-outgoing; Thu, 11 Dec 1997 00:12:59 -0800 (PST) (envelope-from owner-freebsd-current) Received: from mail.cdsnet.net (mail.cdsnet.net [204.118.244.5]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id AAA15857 for ; Thu, 11 Dec 1997 00:12:54 -0800 (PST) (envelope-from mrcpu@cdsnet.net) Received: from mail.cdsnet.net (mail.cdsnet.net [204.118.244.5]) by mail.cdsnet.net (8.8.6/8.8.6) with SMTP id AAA00677; Thu, 11 Dec 1997 00:12:24 -0800 (PST) Date: Thu, 11 Dec 1997 00:12:24 -0800 (PST) From: Jaye Mathisen To: Jason Evans cc: Alex , Steve Passe , current Subject: Re: -current, goliath, smp -- problems In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk 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. Heck, if somebody knows of some memory benchmarking software, I'd be happy to try it out.