Date: Mon, 5 Mar 2001 09:53:31 -0600 (CST) From: Chris Dillon <cdillon@wolves.k12.mo.us> To: "E.B. Dreger" <eddy+public+spam@noc.everquick.net> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: Re: Machines are getting too damn fast Message-ID: <Pine.BSF.4.32.0103050855460.72733-100000@mail.wolves.k12.mo.us> In-Reply-To: <Pine.LNX.4.20.0103050355580.15832-100000@www.everquick.net>
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On Mon, 5 Mar 2001, E.B. Dreger wrote: > > Date: Sun, 04 Mar 2001 19:39:09 -0600 > > From: David A. Gobeille <dgobe@mcs.net> > > > > 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
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