Hyperthreading in non-SMP systems
joynt at bigpond.net.au
Fri May 2 20:31:21 PDT 2003
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
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?
More information about the freebsd-stable