Messages in this thread | | | Date | Tue, 10 Feb 2004 15:33:23 -0500 | From | Bill Davidsen <> | Subject | Re: HT CPU handling - 2.6.2 |
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Hod McWuff wrote: > I've got a 2.0A GHz P4, advertised as non-hyperthread, that seems to be > reporting the presence of a second CPU. It also seems to be disabled by > setting bit 7 of its ID. I've tried compiling with support for 130 CPU's > and nothing changed. What would have to be done to get this disabled > CPU half back online? > > Feb 9 04:45:03 pug ACPI: Local APIC address 0xfee00000 > Feb 9 04:45:03 pug ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled) > Feb 9 04:45:03 pug Processor #0 15:2 APIC version 20 > Feb 9 04:45:03 pug ACPI: LAPIC (acpi_id[0x02] lapic_id[0x81] disabled) > Feb 9 04:45:03 pug Processor #129 invalid (max 16) > Feb 9 04:45:03 pug ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1]) > Feb 9 04:45:03 pug ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1])
Look in /proc/cpuinfo for number of siblings. If it's one you have no HT capability, the stuff for HT is mostly there but there's no sib to share. Sort of like a Siamese twin who's an only child or some such. You have a funky APIC and not much else.
Don't know if the LAPIC is actually useful. -- Bill Davidsen, TMR
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