Date: Fri, 27 Jan 2006 10:16:06 +0000 From: Pete French <petefrench@ticketswitch.com> To: stable@freebsd.org Subject: How do I turn off hyperthreading on 6.0 ? Message-ID: <E1F2QeE-0004UQ-PW@dilbert.firstcallgroup.co.uk>
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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@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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