Date: Sun, 24 Feb 2008 22:00:10 +1100 From: Tigger <tigger@lvlworld.com> To: freebsd-questions@freebsd.org Subject: Dual core CPU's, but only 2 CPU's in-use? Message-ID: <20080224110010.GA4447@edward.lilypie.com>
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Hello. I have a Xeon system with 2 CPU's installed (dual-cores). Under FreeBSD 6.2, a systat reported 4 CPUs in use and so did dmesg. Under FreeBSD 6.3, dmesg is reporting the 4 CPUs, but systat is only reporting 2 CPUs (CPU 0 and CPU 2). How do I enabled the second cores on the CPU's or are they really running but systat is not reporting the CPU load across the cores? dmesg from 6.3 (snipped): CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2790.73-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,SSE2,SS,HTT,TM,PBE> Features2=0x4400<CNXT-ID,xTPR> Logical CPUs per core: 2 real memory = 2147352576 (2047 MB) avail memory = 2096242688 (1999 MB) ACPI APIC Table: <DELL PE1600SC> FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 cpu2 (AP): APIC ID: 6 cpu3 (AP): APIC ID: 7 And sysctrl dev.cpu is interesting, the 4 CPUs are found but only 2 appear to be working (cx_usage is 100% or 0%): # sysctl dev.cpu dev.cpu.0.%desc: ACPI CPU dev.cpu.0.%driver: cpu dev.cpu.0.%location: handle=\_PR_.CPU0 dev.cpu.0.%pnpinfo: _HID=none _UID=0 dev.cpu.0.%parent: acpi0 dev.cpu.0.cx_supported: C1/0 dev.cpu.0.cx_lowest: C1 dev.cpu.0.cx_usage: 100.00% dev.cpu.1.%desc: ACPI CPU dev.cpu.1.%driver: cpu dev.cpu.1.%location: handle=\_PR_.CPU1 dev.cpu.1.%pnpinfo: _HID=none _UID=0 dev.cpu.1.%parent: acpi0 dev.cpu.1.cx_supported: C1/0 dev.cpu.1.cx_lowest: C1 dev.cpu.1.cx_usage: 0% dev.cpu.2.%desc: ACPI CPU dev.cpu.2.%driver: cpu dev.cpu.2.%location: handle=\_PR_.CPU2 dev.cpu.2.%pnpinfo: _HID=none _UID=0 dev.cpu.2.%parent: acpi0 dev.cpu.2.cx_supported: C1/0 dev.cpu.2.cx_lowest: C1 dev.cpu.2.cx_usage: 100.00% dev.cpu.3.%desc: ACPI CPU dev.cpu.3.%driver: cpu dev.cpu.3.%location: handle=\_PR_.CPU3 dev.cpu.3.%pnpinfo: _HID=none _UID=0 dev.cpu.3.%parent: acpi0 dev.cpu.3.cx_supported: C1/0 dev.cpu.3.cx_lowest: C1 dev.cpu.3.cx_usage: 0% Thanks for any pointers on this one! -Tig
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