Date: Tue, 6 Jan 2004 16:30:36 +0100 From: Harald Schmalzbauer <h@schmalzbauer.de> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-current@FreeBSD.org Subject: Re: some HTT questions Message-ID: <200401061630.41005@harrymail> In-Reply-To: <XFMail.20040106102129.jhb@FreeBSD.org> References: <XFMail.20040106102129.jhb@FreeBSD.org>
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--Boundary-02=_gSt+/w5BUDDzk/A Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: quoted-printable Content-Description: signed data Content-Disposition: inline On Tuesday 06 January 2004 16:21, John Baldwin wrote: > On 06-Jan-2004 Harald Schmalzbauer wrote: > > Hi all, > > > > I'm currently working on my first P4 ever. > > I'm planning a colo production machine with FreeBSD 5.2 (RC2 atm). > > The info of dmesg about the CPU shows: > > > > CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2394.13-MHz 686-class CPU) > > Origin =3D "GenuineIntel" Id =3D 0xf27 Stepping =3D 7 > > > > Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,= PGE, > >MCA,CMOV,PAT,PSE36,CLFLUS H,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> > > > > So I think this CPU should be HyperThreading capable which gets hardened > > by those lines: > > > > acpi_cpu0: <CPU> on acpi0 > > acpi_cpu1: <CPU> on acpi0 > > > > But the next line gives my an error about CPU1: > > > > device_probe_and_attach: acpi_cpu1 attach returned 6 > > > > This line shows up a second time between probing of sio and nxp0. > > > > Ny my guess was that HTT should be enabled in the BIOS but the BIOS has > > no entry about HTT. > > > > How can I use HTT and are my assumptions correct? > > Your assumptions are not correct. :) If your CPU does support HTT, then > the dmesg will include an extra line that says > ' Hyperthreading: X logical cpus'. The HTT Feature just means that we > can check to see if this CPU has more than one core. It might still The Feature=3D<HTT> doesn't mean it supports HTT but means we are allowed t= o=20 check if it supports HyperThreading??? Well that's total control. Ok, then I have no HTT CPU and that's because the BIOS doesn't show the=20 HyperThreading menu. Thanks all, =2DHarry > only have one core enabled, however. Your BIOS has to support an HTT > CPU, thus, ACPI has two cpu devices in case you do have a HTT CPU. > However, only one is used in your system (acpi_cpu0) since your CPU > does not support HTT. --Boundary-02=_gSt+/w5BUDDzk/A Content-Type: application/pgp-signature Content-Description: signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQA/+tSgBylq0S4AzzwRAvh0AKCGrWf41+S2uiQFRJ3sHWC68cz1ZACfcfQw oky+yS49HLlOG949okHTqYE= =tFtt -----END PGP SIGNATURE----- --Boundary-02=_gSt+/w5BUDDzk/A--
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