Date: Fri, 28 Jun 2002 18:03:45 -0700 From: Aaron Seelye <aseelye@urx.com> To: John David Duncan <jdd@greatschools.net>, freebsd-smp@freebsd.org, <freebsd-stable@freebsd.org> Subject: Re: 2 xeons = 4 CPUs? Message-ID: <200206281803.45317.aseelye@urx.com> In-Reply-To: <Pine.OSX.4.44.0206281443230.379-100000@dh8.office.greatschools.net> References: <Pine.OSX.4.44.0206281443230.379-100000@dh8.office.greatschools.net>
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Yes, that's hyperthreading (as two others before me have said), but one thing to keep in mind is that you may want to disable it, as on some benchmarks it actually /slows down/ the system. YMMV. Aaron On Friday 28 June 2002 02:52 pm, John David Duncan wrote: > Hey, > > I just installed 4.6-RELEASE on a dual 1.8Mhz Xeon + Tyan S2720 > motherboard (a Relion 140 server from Penguin Computing, actually). > When I reboot with an SMP kernel, I see: > > CPU: Pentium 4 (2199.76-Mhz 686-class CPU) > CPU: Pentium 4 (2199.76-Mhz 686-class CPU) > CPU: Pentium 4 (2199.76-Mhz 686-class CPU) > CPU: Pentium 4 (2199.76-Mhz 686-class CPU) > SMP: AP CPU #1 Launched! > SMP: AP CPU #2 Launched! > SMP: AP CPU #3 Launched! > > That's twice as many CPUs as I think I have, each going 400Mhz faster. Is > this safe? Correct? Is it that hyperthreading stuff? Should I disable > it? > > Thanks > > - JD > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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