Date: Wed, 13 Aug 2003 11:35:14 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: "Dr. Richard E. Hawkins" <hawk@slytherin.ds.psu.edu> Cc: "Scott M. Likens" <damm@fpsn.net> Subject: Re: Dual P4 2.4Ghz Xeon With Hyperthreading enabled... Message-ID: <XFMail.20030813113514.jhb@FreeBSD.org> In-Reply-To: <20030813123415.GB6964@slytherin.ds.psu.edu>
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On 13-Aug-2003 Dr. Richard E. Hawkins wrote: > On Tue, Aug 12, 2003 at 08:33:57PM -0500, Cagle, John (ISS-Houston) wrote: >> I think the valid settings are only 0 or 1, with the default being 1 >> which will disable all logical CPUs. If you want to enable the extra >> logical CPUS, then set it to 0 (zero). They will come online >> immediately. > > <please don't top-post; it makes following threads difficult> > > That can't be right. I've never done anything to configure the logical > cpus on mine; they just showed up unexpectedly when i switched from > stable to current. Now I have: > > slytherin ttyp1:hawk>sysctl -a | grep cpu > kern.threads.virtual_cpu: 4 > kern.ccpu: 1948 > kern.smp.cpus: 4 > hw.ncpu: 4 > machdep.cpu_idle_hlt: 1 > machdep.hlt_cpus: 10 > machdep.hlt_logical_cpus: 1 > machdep.logical_cpus_mask: 10 > > > It launches four logical cpus all on it's own. It did panic during > shutdown yesterday; If I read the messages right as it flashed by, it > was because cpu#2 got the shutdown order. Your logical CPU's aren't doing anything though, even though they are started up. John's explanation is correct. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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