Date: Fri, 27 Jun 2003 18:39:12 -0500 From: Glenn Johnson <gjohnson@srrc.ars.usda.gov> To: Doug White <dwhite@gumbysoft.com> Cc: current@freebsd.org Subject: Re: Hyperthreading Message-ID: <20030627233912.GA90348@gforce.johnson.home> In-Reply-To: <20030627154252.X5016@carver.gumbysoft.com> References: <20030627181836.GA81335@node1.cluster.srrc.usda.gov> <20030627154252.X5016@carver.gumbysoft.com>
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On Fri, Jun 27, 2003 at 03:46:47PM -0700, Doug White wrote: > On Fri, 27 Jun 2003, Glenn Johnson wrote: > > > I have a P4 processor on order that will support hyperthreading. > > I was wondering what the general opinion is on enabling HTT for > > FreeBSD-5 (current). > > > > Thanks for any input. > > man 4 smp > > See the machdep.hlt_logical_cpus sysctl. Thanks. I had read the smp manual page. I know _how_ to enable HTT; I was wondering whether I _should_ enable it. It seems the answer is that it is not beneficial in its current state because the scheduler does not yet differentiate between physical and logical processors. -- Glenn Johnson glennpj@charter.net
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