Date: Tue, 13 Dec 2005 14:52:01 -0500 From: Charles Swiger <cswiger@mac.com> To: robert@webtent.com Cc: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Multiple CPUs Message-ID: <2DED9AA7-DD0C-43CE-9BDB-45E646B1F604@mac.com> In-Reply-To: <1134501177.13444.56.camel@columbus.webtent.org> References: <1134501177.13444.56.camel@columbus.webtent.org>
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On Dec 13, 2005, at 2:12 PM, Robert Fitzpatrick wrote: > I guess this means my new server is only using one of my CPUs? > > esmtp# grep CPU /var/log/dmesg.today > CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2399.33-MHz 686-class CPU) > Hyperthreading: 2 logical CPUs > cpu0: <ACPI CPU (2 Cx states)> on acpi0 > > Can someone point me to the best doc for enabling use of both CPUs on > the FreeBSD 5.4 server? I assume the kernel needs built with options. Note that if you've only got one physical HTT-capable CPU, running in single-processor mode is likely to give better performance than running SMP just to enable the hyperthreaded virtual CPU. If you've got a dual-CPU box and need to run SMP for that anyway, then using HTT seems to sometimes help and sometimes reduce performance. -- -Chuck
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