On 10/1/18 10:44 AM, Dana Whitlow wrote:
Isn't it the case that computer clocks these days are subject to two
influences that make them worthless for timing?
1. Deliberate random FM to spectrally spread RFI leakage.
and
2, Wild variations of clock speed according to usage needs of the moment,
in order to reduce average power consumption and thermal loading.
yes and no..
microcontrollers and things with microcontrollers do use spectrum
dithering, it's less common in a PC.
While the "instruction rate" might vary with the needs of the moment and
die temperature, there's usually some clock and corresponding counter
that runs at a relatively constant rate so the CPU knows what time it is.
That said, a 10 ppm (or even 50 ppm) oscillator in a PC would be "high
performance"
My macbook air shows 56.652 in ntp.drift
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