On 8/20/2013 11:40 AM, Wojciech Owczarek wrote:
I would recommend the TSC time source: lowest read overhead.
All three have different behaviours - different (cold start) frequency
offset and different drift rates once stabilised and then left drifting.
By default, the tsc is calibrated at each boot, which means that timing
will likely change (and ntp drift values will be off) each time you boot.
There's a linux kernel command line option which will fix that and
provide consistency between boots, something like "clocksource=tsc
tsc_khz=2410988". The exact value depends on how fast the processor is
clocked.
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