How do I turn off hyperthreading on 6.0 ?
Pete French
petefrench at ticketswitch.com
Fri Jan 27 02:16:12 PST 2006
I though that machdep.hyperthreading_allowed had to be set to 1 to
turn on hyperthreading ? I have a dual processor HP blade, and
when I boot it up with an SMP kernel I get 4 CPU's. Setting that flag
does not have any effect!
Any thoughts ? I dont think I have two CPU's each with dual
core and without hyperthreading somehow! (though the thought did cross
my mind...)
webadmin at websvr04$ sysctl machdep.hyperthreading_allowed
machdep.hyperthreading_allowed: 0
CPU: Intel(R) Xeon(TM) CPU 3.60GHz (3600.14-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf43 Stepping = 3
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>
Features2=0x659d<SSE3,RSVD2,MON,DS_CPL,EST,TM2,CNTX-ID,CX16,<b14>>
AMD Features=0x20000000<LM>
Hyperthreading: 2 logical CPUs
real memory = 3758043136 (3583 MB)
avail memory = 3678736384 (3508 MB)
ACPI APIC Table: <HP 00000083>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
cpu2 (AP): APIC ID: 6
cpu3 (AP): APIC ID: 7
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