Date: Fri, 27 May 2005 10:49:06 -0400 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-smp@FreeBSD.org Cc: "Singh, Vijay" <Vijay.Singh@netapp.com> Subject: Re: SMP with HTT disabled Message-ID: <200505271049.06850.jhb@FreeBSD.org> In-Reply-To: <637A278D8D0DBC438EA5E75C6E1818B9044107CB@magenta.hq.netapp.com> References: <637A278D8D0DBC438EA5E75C6E1818B9044107CB@magenta.hq.netapp.com>
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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: > 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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