Date: Sun, 21 Mar 2010 15:40:17 -0700 From: Garrett Cooper <yanefbsd@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: FreeBSD-Hackers <freebsd-hackers@freebsd.org> Subject: Logical CPUs cannot be disabled via W3520 Message-ID: <7d6fde3d1003211540n30a7041dmd187b57efd0e9242@mail.gmail.com>
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Someone on the forums [1] noticed that machdep.hlt_logical_cpus
was unavailable on their system, and I did some poking around and
noticed that it was as well. Should SMT logical CPUs be disable(-able)
via machdep.hlt_logical_cpus as well or is it just classic HTT based
chips?
Thanks,
-Garrett
$ sysctl machdep.
machdep.acpi_timer_freq: 3579545
machdep.enable_panic_key: 0
machdep.adjkerntz: 25200
machdep.wall_cmos_clock: 1
machdep.disable_rtc_set: 0
machdep.acpi_root: 1029056
machdep.disable_mtrrs: 0
machdep.idle: acpi
machdep.idle_available: spin, mwait, mwait_hlt, hlt, acpi,
machdep.hlt_cpus: 0
machdep.prot_fault_translation: 0
machdep.panic_on_nmi: 1
machdep.kdb_on_nmi: 1
machdep.tsc_freq: 2694121808
machdep.i8254_freq: 1193182
$ sysctl hw.machine hw.model
hw.machine: amd64
hw.model: Intel(R) Xeon(R) CPU W3520 @ 2.67GHz
dmesg snippet:
CPU: Intel(R) Xeon(R) CPU W3520 @ 2.67GHz (2694.12-MHz K8-class CPU)
Origin = "GenuineIntel" Id = 0x106a5 Family = 6 Model = 1a Stepping = 5
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=0x9ce3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,DCA,SSE4.1,SSE4.2,POPCNT>
AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
AMD Features2=0x1<LAHF>
TSC: P-state invariant
real memory = 12884901888 (12288 MB)
avail memory = 12379992064 (11806 MB)
ACPI APIC Table: <091109 APIC2100>
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
cpu2 (AP): APIC ID: 2
cpu3 (AP): APIC ID: 3
cpu4 (AP): APIC ID: 4
cpu5 (AP): APIC ID: 5
cpu6 (AP): APIC ID: 6
cpu7 (AP): APIC ID: 7
[1] http://forums.freebsd.org/showthread.php?t=12527
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