[time-nuts] Cheap jitter measurements

Gerhard Hoffmann dk4xp at arcor.de
Mon Apr 9 22:23:27 EDT 2018



Am 10.04.2018 um 01:03 schrieb Gary E. Miller:
> Yo Hal!
>
> On Mon, 09 Apr 2018 13:53:21 -0700
> Hal Murray <hmurray at megapathdsl.net> wrote:
>
>> The API  for the kernel clock can be read to a ns.  I don't see ntpd
>> having much use for finer grain than that.  I should look at the
>> source to see what the internal details look like.
> Yeah, but the granularity is much worse.
>

And with the new generation of attacks against the prefetch queue /
instruction decoder latency that probably will be blurred even more.

I don't expect my computers' clock to be more precise than needed
for makefiles. Anything more precise is better taken care of by hardware.

regards, Gerhard






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