Date: Fri, 31 Jan 2003 12:43:03 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: John Baldwin <jhb@FreeBSD.org> Cc: "Daniel C. Sobral" <dcs@tcoip.com.br>, freebsd-current@FreeBSD.ORG, Trish Lynch <trish@bsdunix.net>, Matthew Dillon <dillon@apollo.backplane.com> Subject: Re: Hyperthreading and machdep.cpu_idle_hlt Message-ID: <Pine.BSF.4.21.0301311241170.45015-100000@InterJet.elischer.org> In-Reply-To: <XFMail.20030131150526.jhb@FreeBSD.org>
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On Fri, 31 Jan 2003, John Baldwin wrote: > >> AT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,<b28>,ACC> > >> > >> It has HTT set but it's only a 1.2GHz box and I heard somewhere that only > >> 2+ GHz P4's had hyperthreading. I noticed some MFCs to stable that > >> suggested hyperthreading support but I do not know if full hyperthreading > >> support has been MFCd yet or is intended to be MFCd to -stable. > > > > AFAIK, full hyperthreading support, as it is, has been merged to > > -stable. It consists of a patch to recognize the virtual CPUs, so they > > will be dealt with like any SMP system, as long as HTT is enabled on the > > BIOS. > > Well, sort of. We have no way of knowing if it is off in the BIOS unless > we use the ACPI tables to enumerate CPU's (which we don't), so turning it > off in the BIOS won't turn it off in FreeBSD for the time being. :) > I have a 2,8GHz p4 here which has HTT and has a bios option for Interrupt mode: [APIC/PIC] I'm using APIC mode but an SMP (today's 4.x) kernel panics imediatly saying it can;t find an APIC. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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