Date: Mon, 10 Mar 2003 19:29:18 +0100 From: Richard Nyberg <rnyberg@it.su.se> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-smp@FreeBSD.org Subject: Re: hyperthreading randomness Message-ID: <20030310182918.GA32085@murmeldjur.it.su.se> In-Reply-To: <XFMail.20030310130013.jhb@FreeBSD.org> References: <20030308121852.GA25380@murmeldjur.it.su.se> <XFMail.20030310130013.jhb@FreeBSD.org>
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On Mon, Mar 10, 2003 at 01:00:13PM -0500, John Baldwin wrote: > > On 08-Mar-2003 Richard Nyberg wrote: > > I have a Dell Precision 450 with 2 xeon CPU:s. > > The weird thing is that it randomly boots up > > with either 2 or 4 CPUs on the same 4-STABLE kernel. > > 2 more often than 4. It seems a bit unpredictable :( > > Hmm, I have no idea about that one. Hmm, it seems to be a > "feature" of the BIOS perhaps. It seems that it may be listing > the second CPU with an APIC ID of 3 (it's second core) instead > of 2 (it's first core) in which case the HTT code sees that > something is not right and doesn't start up any extra processors. > I see. Do you think this quirk will cause trouble when FreeBSD gets its CPU info from ACPI? Happy hacking ;) -Richard To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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