> I am adding some logic to synchronize with the PPS signal from
> the GPS device that I hooked up to a RaspberryPi.  With this
> change the TOD clock should be accurate to within 10 to 20 µs.
> So I for one welcome the new syscall! [Though its introduction
> could've been better managed]

even a syscall on a rpi is going to cost you at least 5-10µs
and clock drift will make this, and your second point very hard.

> But using a TOD clock for measuring performance seems wrong
> since it will also have to account for leapseconds (at the
> moment timesync happily ignores leapseconds).

- erik

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