From owner-freebsd-hackers Fri Feb 19 15:45:25 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from smtp03.primenet.com (smtp03.primenet.com [206.165.6.133]) by hub.freebsd.org (Postfix) with ESMTP id 14189118BD for ; Fri, 19 Feb 1999 15:43:58 -0800 (PST) (envelope-from tlambert@usr02.primenet.com) Received: (from daemon@localhost) by smtp03.primenet.com (8.8.8/8.8.8) id QAA18726; Fri, 19 Feb 1999 16:43:50 -0700 (MST) Received: from usr02.primenet.com(206.165.6.202) via SMTP by smtp03.primenet.com, id smtpd018616; Fri Feb 19 16:43:43 1999 Received: (from tlambert@localhost) by usr02.primenet.com (8.8.5/8.8.5) id QAA11287; Fri, 19 Feb 1999 16:42:15 -0700 (MST) From: Terry Lambert Message-Id: <199902192342.QAA11287@usr02.primenet.com> Subject: Re: vm_page_zero_fill To: dyson@iquest.net Date: Fri, 19 Feb 1999 23:42:09 +0000 (GMT) Cc: tlambert@primenet.com, toasty@home.dragondata.com, mike@smith.net.au, hackers@FreeBSD.ORG In-Reply-To: <199902172139.QAA70278@y.dyson.net> from "John S. Dyson" at Feb 17, 99 04:39:30 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > This is robbing Peter to pay Paul; in a way. The base assumption > > that you are hiding is that you aren't constrained by memory > > bandwidth. This isn't true if you are nearly saturating a PCI > > bus with 4 BT848's (to pick the highest memory bandwidth application > > I know about). > > I just realized something: > > Memory bandwidth is >> PCI bandwidth on good designs. I believe > that the PCI and memory busses are decoupled on at least some X86 machines. Well, I was just guessing about an application that would eat sufficient memory bandwidth. If BT848's on PCI can't, then make up your own story for what his ultra-secret product actually is. 8-). Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message