Hi Jeff,
I have a single-CPU system with P4 HTT-enabled processor
(7.1-RELEASE-p3), kernel compiled with SCHED_ULE.
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FreeBSD 7.1-RELEASE-p3 #0: Fri Feb 20 09:53:32 UTC 2009
r...@foo.com:/usr/obj/usr/src/sys/SSP-PRODUCTION7
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (2992.51-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf34 Stepping = 4
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=0x441d<SSE3,DTES64,MON,DS_CPL,CNXT-ID,xTPR>
Logical CPUs per core: 2
real memory = 3758030848 (3583 MB)
avail memory = 3674083328 (3503 MB)
ACPI APIC Table: <IntelR AWRDACPI>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
ioapic0: Changing APIC ID to 2
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
machdep.cpu_idle_hlt: 1
machdep.hlt_cpus: 0
machdep.hlt_logical_cpus: 0
machdep.logical_cpus_mask: 2
If I flip machdep.hyperthreading_allowed sysctl, I still can see
processes scheduled to both logical CPUs, yet, if I check IRQ status in
the systat -vm, the CPU1 is not getting any timer interrupts, while CPU0
gets twice the normal amount. I wonder if something is broken - I would
expect no processes to be scheduled to the CPU1.
machdep.hyperthreading_allowed=1:
top: http://sobomax.sippysoft.com/~sobomax/ScreenShot458.png
systat -vm: http://sobomax.sippysoft.com/~sobomax/ScreenShot459.png
machdep.hyperthreading_allowed=0:
top: http://sobomax.sippysoft.com/~sobomax/ScreenShot460.png
systat -vm: http://sobomax.sippysoft.com/~sobomax/ScreenShot461.png
Please let me know if any other debug information is needed.
-Maxim
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