[email protected] wrote:
My new prototype driver refclock_phc() uses as its clock the PTP
Hardware Clock (PHC) found on one of the newer LAN NICs which are PTP
(IEEE 1588) aware. This driver is producing phenomenal results (under
LINUX 3.12 with linuxPTP): the overlapping Allan deviation computed
from loopstats phase offsets alone reaches a stability of 6e-12 in
under 2e5 seconds, and the modified Allan deviation reaches 2e-13.
This is extremely nice!
Do you use the PTP hw to also timestamp actual ntp packets, or just the
onboard tcxo (or whatever the LAN card osc is) as a stable time base?
Terje
This is quite useful, as eventually most all NICs will be
PTP-enabled, and can be used as slaves as above, or even GrandMasters
(with GPS, for example).
I will ship my driver to Network Time Foundation when it is
completed. This is a practical realization of PTP-NTP partnering in a
refclock driver! Regards, Rich Schmidt
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