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tsc：无法根据 PIT 进行校准

tag-icon • tag-icon boot 16.04 dmesg
tsc：无法根据 PIT 进行校准 
$ dmesg | grep tsc
[    0.000000] tsc: Unable to calibrate against PIT
[    0.000000] tsc: using HPET reference calibration
[    0.000000] tsc: Detected 4008.361 MHz processor
[    1.608138] tsc: Refined TSC clocksource calibration: 4008.029 MHz
[    1.608140] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x39c5fcfe866, max_idle_ns: 440795249027 ns
[    2.608431] clocksource: Switched to clocksource tsc
  1. 什么是 tsc？
  2. 这是什么Unable to calibrate against PIT意思？

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