Date: Sat, 3 May 2003 13:32:25 +1000 (EST) From: Steve Joynt <joynt@bigpond.net.au> To: freebsd-stable@freebsd.org Subject: Hyperthreading in non-SMP systems Message-ID: <20030503132725.D7983@mocha.cable.nu>
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Hi, Is it possible to have Hyperthreading enabled in non-SMP systems? According to LINT the HTT option requires SMP and APIC_IO, but when I include both of those in my P4 3.06GHz system it panics on startup with: panic: pmap_bootstrap: no local apic! mp_lock = 0000000c; cpuid = 0; lapic.id = 00000000 I have hyperthreading enabled in the bios, and when booting with a standard kernel I get the following: CPU: Intel(R) Pentium(R) 4 CPU 3.06GHz (3073.65-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf27 Stepping = 7 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Hyperthreading: 2 logical CPUs but there's no further messages about enabling both cpus. Does this mean that HTT is only supported on systems with have multiple (physical) cpus? thanks, - Steve
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