Date: Sat, 22 Apr 2000 19:00:10 -0700 From: Kent Stewart <kstewart@3-cities.com> To: Andy Coates <andy@friends-tv.net> Cc: Greg Lehey <grog@lemis.com>, freebsd-questions@FreeBSD.ORG Subject: Re: Dual Processors Message-ID: <3902592A.66193EE1@3-cities.com> References: <017701bfac70$2152eaa0$0100a8c0@blade> <20000423105631.E4675@freebie.lemis.com> <022f01bfacc5$f9d11ff0$0100a8c0@blade>
next in thread | previous in thread | raw e-mail | index | archive | help
Andy Coates wrote: > > ----- Original Message ----- > From: "Greg Lehey" <grog@lemis.com> > To: "Andy Coates" <andy@friends-tv.net> > Cc: <freebsd-questions@FreeBSD.ORG> > Sent: Sunday, April 23, 2000 2:26 AM > Subject: Re: Dual Processors > > > On Saturday, 22 April 2000 at 16:33:34 +0100, Andy Coates wrote: > > > Hi, > > > > > > I currently have a Abit BP6 motherboard with 2 celeron 466's. I'm not > sure > > > how to make FreeBSD make use of both these processors, can anyone give > me a > > > point in the right direction as to where I should be looking? > > > > > > I added SMP options in the kernel config, but I wasn't too sure what to > use > > > so I left the defaults in: > > > # To make an SMP kernel, the next two are needed > > > options SMP # Symmetric MultiProcessor Kernel > > > options APIC_IO # Symmetric (APIC) I/O > > > # Optionally these may need tweaked, (defaults shown): > > > options NCPU=2 # number of CPUs > > > options NBUS=4 # number of busses > > > options NAPIC=1 # number of IO APICs > > > options NINTR=24 # number of INTs > > > > > > Would that be okay? And how can I test that I am using both processors? > I > > > tried running a CPU intensive program and the load average never went > over > > > 1, which I thought would reach 2 if 2 processors were in use. > > > > If you run one CPU intensive program, it will run in one CPU. You > > need at least two to use both CPUs. Take a look at dmesg. You should > > see: > > > > SMP: AP CPU #1 Launched! > > Yep, its there. I did actually see that message on bootup, and first > impression was that only #1 CPU had been started or something, and wondered > where #2 was :-) > Thanks for clearing it up. > > Now I rest in the knowledge my box is running at its fastest :-) That won't necessarily be true using a Celeron. The bottleneck in the kind of calculations I do is the PC-66 memory. In scaling tests that I did, my Celeron 433a ran at about the same throughput as a p-II 300 on a 100MHz FSB. They only sold them for 66MHz bus but that was the ratio I obtained. A pair of dual P-II 350's with 100MHz FSB could out produce your dual Celeron's. Kent -- Kent Stewart Richland, WA mailto:kstewart@3-cities.com http://www.3-cities.com/~kstewart/index.html FreeBSD News http://daily.daemonnews.org/ SETI(Search for Extraterrestrial Intelligence) @ HOME http://setiathome.ssl.berkeley.edu/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3902592A.66193EE1>