Disabled HTT in the kernel but not the BIOS?
kirk at strauser.com
Tue Nov 21 04:40:18 PST 2006
I have a dual Xeon/HTT server that I run with machdep.hyperthreading_allowed
set to 0. At boot, it detects 4 CPUs:
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
but top confirms that only processors 0 and 2 are actually running. So, other
than top being unwilling to report more than 50% CPU load, are there any
other problems with running like this, such as the cache being split for the
benefit of the HTT that I'm not enabling? I can live with the cosmetic
glitch, but don't want to take a pointless performance hit.
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