From owner-freebsd-hackers Mon Mar 5 7:53:41 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from mail.wolves.k12.mo.us (mail.wolves.k12.mo.us [207.160.214.1]) by hub.freebsd.org (Postfix) with ESMTP id 2178137B71A for ; Mon, 5 Mar 2001 07:53:36 -0800 (PST) (envelope-from cdillon@wolves.k12.mo.us) Received: from mail.wolves.k12.mo.us (cdillon@mail.wolves.k12.mo.us [207.160.214.1]) by mail.wolves.k12.mo.us (8.9.3/8.9.3) with ESMTP id JAA75933; Mon, 5 Mar 2001 09:53:32 -0600 (CST) (envelope-from cdillon@wolves.k12.mo.us) Date: Mon, 5 Mar 2001 09:53:31 -0600 (CST) From: Chris Dillon To: "E.B. Dreger" Cc: Subject: Re: Machines are getting too damn fast In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Mon, 5 Mar 2001, E.B. Dreger wrote: > > Date: Sun, 04 Mar 2001 19:39:09 -0600 > > From: David A. Gobeille > > > > It would also be interesting to see the numbers for an Athlon/PIII > > system with DDR, if anyone has such a machine. > > Personally, I'd be [more] interested in a ServerWorks III HE core chipset > with four-way interleaved SDRAM. :-) I've got a ServerWorks III HE-SL system with 512MB of two-way interleaved PC133 SDRAM and dual PIII-800's. Is that close enough? :-) Here is my "memory bandwidth test", much much simpler and less scientific than Matt's: dd if=/dev/zero of=/dev/null bs=10m count=1000 1000+0 records in 1000+0 records out 10485760000 bytes transferred in 23.716504 secs (442129245 bytes/sec) I just did a recent 4.2-STABLE 'make -j 4 buildworld' on that system in just over 34 minutes. Here's the time output: 1980.707u 768.223s 34:20.89 133.3% 1297+1456k 39517+6202io 1661pf+0w > If one _truly_ needs the bandwidth of Rambus (which, IIRC, is > higher real-world latency than SDRAM), then how about having the > bus bandwidth to back it up? The higher real-world latency of RDRAM over SDRAM is what makes the benefits of its higher bandwidth so questionable. PC2100 DDR-SDRAM -- which has higher latencies than regular SDRAM but still lower than RDRAM -- should have it beat soundly, though we'll have to wait for some systems that are actually designed to take advantage of it to say for sure. :-) -- Chris Dillon - cdillon@wolves.k12.mo.us - cdillon@inter-linc.net FreeBSD: The fastest and most stable server OS on the planet. For IA32 and Alpha architectures. IA64, PPC, and ARM under development. http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message