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...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...