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 -- --------------------------> Aristedes Maniatis CEO, ish https://www.ish.com.au GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
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