Date: Mon, 14 Aug 2017 13:25:38 +1000 From: Aristedes Maniatis <ari@ish.com.au> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: TSC timekeeping and cpu states Message-ID: <f023ffcf-b968-7cc4-2b5a-2ed7e437fc18@ish.com.au>
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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
CEO, ish
https://www.ish.com.au
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