Date: Mon, 22 Mar 2010 09:47:53 -0400 From: John Baldwin <jhb@freebsd.org> To: Garrett Cooper <yanefbsd@gmail.com> Cc: FreeBSD-Hackers <freebsd-hackers@freebsd.org>, Colin Percival <cperciva@freebsd.org> Subject: Re: Logical CPUs cannot be disabled via W3520 Message-ID: <201003220947.53722.jhb@freebsd.org> In-Reply-To: <7d6fde3d1003211540n30a7041dmd187b57efd0e9242@mail.gmail.com> References: <7d6fde3d1003211540n30a7041dmd187b57efd0e9242@mail.gmail.com>
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On Sunday 21 March 2010 6:40:17 pm Garrett Cooper wrote: > 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? I suspect that it should work for SMT as well. > 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 > -- John Baldwin
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