Date: Mon, 22 Mar 2010 08:38:09 -0700 From: Garrett Cooper <yanefbsd@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: FreeBSD-Hackers <freebsd-hackers@freebsd.org>, Colin Percival <cperciva@freebsd.org> Subject: Re: Logical CPUs cannot be disabled via W3520 Message-ID: <232074FC-7E18-41BB-AF5A-FDD13D449539@gmail.com> In-Reply-To: <201003220947.53722.jhb@freebsd.org> References: <7d6fde3d1003211540n30a7041dmd187b57efd0e9242@mail.gmail.com> <201003220947.53722.jhb@freebsd.org>
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On Mar 22, 2010, at 6:47 AM, John Baldwin <jhb@freebsd.org> wrote: > 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 Which means that because the support isn't there it'll need to be added; I'll file a PR so this is tracked and see if I can provide a patch for this. Thanks! -Garrett
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