Date: Fri, 27 May 2005 15:52:19 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Julian Elischer <julian@elischer.org> Cc: freebsd-smp@FreeBSD.org, "Singh, Vijay" <Vijay.Singh@netapp.com> Subject: Re: SMP with HTT disabled Message-ID: <200505271552.20456.jhb@FreeBSD.org> In-Reply-To: <42976588.8030807@elischer.org> References: <637A278D8D0DBC438EA5E75C6E1818B9044107CB@magenta.hq.netapp.com> <200505271049.06850.jhb@FreeBSD.org> <42976588.8030807@elischer.org>
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On Friday 27 May 2005 02:23 pm, Julian Elischer wrote: > John Baldwin wrote: > >On Thursday 26 May 2005 05:04 pm, Singh, Vijay wrote: > >>Hello, I am trying to disable HTT to run some tests. From dmesg I have: > >> > >>CPU: Intel(R) Xeon(TM) CPU 2.66GHz (2666.77-MHz 686-class CPU) > >> Origin = "GenuineIntel" Id = 0xf29 Stepping = 9 > >> > >>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,S > >>SE2,SS,HTT,TM,PBE> > >> Hyperthreading: 2 logical CPUs > >>real memory = 1073676288 (1023 MB) > >>avail memory = 1041121280 (992 MB) > >>ACPI APIC Table: <A M I OEMAPIC > > >>FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs > >> cpu0 (BSP): APIC ID: 0 > >> cpu1 (AP): APIC ID: 1 > >> > >># cat /boot/loader.conf > >>machdep.hlt_logical_cpus=1 > >> > >>And mptable output is below. It seems to me that the kernel does not > >>bring up the 2nd physical CPU. Am I right or wrong. > > > >The kernel only sees 1 physical CPU. The MPTable only shows 1 physical > > CPU as well: > > note that mptable shows both HTT cpus on some motherboards and only one > entry > per chip on others. Yes, but clearly, the MP Table is only listing 1 CPU, so the machine cannot have _2_ physical CPUs in it that the BIOS knows about. > >>MP Config Base Table Entries: > >> > >>-- > >> > >>Processors: APIC ID Version State Family Model Step Flags > >> > >>0 0x14 BSP, usable 15 2 9 0xbfebfbff > >> > >>-- -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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