Date: Wed, 11 Sep 2002 13:09:14 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Doug White <dwhite@gumbysoft.com> Cc: freebsd-hackers@freebsd.org, hackers@d.sparks.net Subject: Re: Dell 2650 SMP perf question Message-ID: <XFMail.20020911130914.jhb@FreeBSD.org> In-Reply-To: <20020910190709.T70034-100000@carver.gumbysoft.com>
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On 11-Sep-2002 Doug White wrote: > Random notes: > > On Tue, 10 Sep 2002 hackers@d.sparks.net wrote: > >> Hyperthreading is turned off, I believe. There aren't any >> "hyperthreading" swithes in the bios I could find, but the "logical >> processor" option is turned off. > > HyperThreading is not supported on FreeBSD at current. It requires some > ACPI work which hasn't happened yet. Not quite. It depends on the BIOS. Some BIOS's include logical CPU's in the mptable, in which case FreeBSD will work with them fine. Some only include logical CPU's in the APIC MADT which FreeBSD doesn't yet use on i386 (we use it on ia64 and will eventually use it on i386 as we need it for ACPI interrupt routing on SMP.) -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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