Date: Wed, 12 Jan 2005 14:58:49 -0500 From: Bryan Fullerton <fehwalker@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: Hyperthreading hurts 5.3? Message-ID: <35de0c30050112115842aa3b17@mail.gmail.com> In-Reply-To: <20050112052901.GA61033@osiris.chen.org.nz> References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247> <20050112014359.GA3722@gothmog.gr> <B8CC38DE-6455-11D9-87A5-000D93AD26C8@tntluoma.com> <35de0c30050111210235ea3060@mail.gmail.com> <20050112052901.GA61033@osiris.chen.org.nz>
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On Wed, 12 Jan 2005 18:29:01 +1300, Jonathan Chen <jonc@chen.org.nz> wrote: > On Wed, Jan 12, 2005 at 12:02:37AM -0500, Bryan Fullerton wrote: > > By default the system will detect a HTT processor, but can only launch > > the second 'virtual' CPU core if you recompile the kernel with the SMP > > option enabled. > > Not true on 5.3+ GENERIC systems. If you look at dmesg, you'll see the > second virtual CPU launched as well as the extra column in top(1) if > you enable HTT in the BIOS. You are incorrect. There is no SMP option in the 5.3-R i386 GENERIC config file as distributed. Other platforms (sparc64 and alpha) do ship with SMP enabled by default. They're not using HTT, though, so are irrelevant to this discussion. Bryan
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