Date: Sun, 14 Sep 1997 20:55:03 -0700 From: David Greenman <dg@root.com> To: Simon Shapiro <Shimon@i-connect.net> Cc: Terry Lambert <tlambert@primenet.com>, missmanp@milo.cfw.com, freebsd-smp@freebsd.org Subject: Re: SMP in FreeBSD 3.x.x Message-ID: <199709150355.UAA24481@implode.root.com> In-Reply-To: Your message of "Sun, 14 Sep 1997 13:03:59 PDT." <XFMail.970914130359.Shimon@i-Connect.Net>
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>:-) was that aroud 30 processors is where scalability will fall off. We >used Dynix + Oracle for O/S application model. Processor was Pentium. If >I remember correctly, the P6-200 has worse instructions/memory/IO bandwidth >ratios than Pentiums-66 does. That led to the conclusion that we will not >grow beyond 30 either. I will not go into what the initial P7 was supposed This contradicts a paper that was given at a recent Usenix-sponsored conference that shows that the amount of main memory traffic in P6 systems is *dramatically* reduced over Pentium systems. I forget the exact ratio, but it is something like 1/5th. This is entirely due to the superior cache architecture of the P6. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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