Date: Wed, 10 Dec 1997 18:19:05 -0800 (PST) From: Alex <garbanzo@hooked.net> To: Jason Evans <jasone@canonware.com> Cc: Steve Passe <smp@csn.net>, current <current@FreeBSD.ORG> Subject: Re: -current, goliath, smp -- problems Message-ID: <Pine.BSF.3.96.971210181823.1768K-100000@zippy.dyn.ml.org> In-Reply-To: <Pine.LNX.3.95.971209231804.248N-100000@paladio>
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On Tue, 9 Dec 1997, Jason Evans wrote: > Well, I don't know that I would necessarily expect this to be as cool as > it sounds. I'm not an expert on this by any means, but I've > repeatedly heard the following: > > Tightly coupled MP machines work well until memory bandwidth becomes a > bottleneck. Last I heard, the memory bandwidth on Intel-based machines is > 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. > =) Who knows, HP may have (and hopefully did) use a different sort of memory bus, and tweaked whatever else might not be up to snuff for 8cpus. - alex
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