TSC timekeeping and cpu states

[Aristedes Maniatis]

I note that in FreeBSD 11, we now have this:

    # grep performance_cx_lowest /etc/defaults/rc.conf
    performance_cx_lowest="C2"	# Online CPU idle state

However this wiki page suggests that C1 is the default

    https://wiki.freebsd.org/TuningPowerConsumption


Are these inconsistent?


I went looking for this because I've been having trouble with the TSC-low timecounter hardware choice and my system clock running at about 80% of normal speed. Moving to ACPI-fast solved this problem.

Could the power saving CPU states be related to this problem, or should I look elsewhere for the TSC issue?

This is a server, not a laptop.


Thanks
Ari



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Aristedes Maniatis
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https://www.ish.com.au
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