> In contrast, the same machine running with TSC and standard
> PN! sees massive drift, upwards of an hour, within an hour.
Do you see the same drift when you lock date on a single CPU
with taskset?
> If the TSCnow! patch reduces measured drift down to a second
> a week, would you consider that acceptable?
No because even one second a week will break timing badly
over time.
I believe the only good solution unless hardware helps would
be to use per CPU TSC offsets as discussed earlier. Even that
is a bit risky because there can be still very small drifts,
but they should be limited by a clock tick error max and
might work out.
-Andi
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