I've seen SO_TIMESTAMP and friends in ethtool but I have no idea what it
is or how it works, can you point me in the right direction please?
Alec
---
On 2021-12-14 18:12, Steven Sommars wrote:
On Tue, Dec 14, 2021 at 11:40 AM Michael Rothwell <[email protected]>
wrote:
I see some high offsets on my local monitoring (synced to
time.google.com
).
Especially time-e-b on ipv6.
This observation is correct and is caused by queuing delay on the NIST
server. NIST NTP mode 3 requests
are apparently time-stamped at application level, rather than using
SO_TIMESTAMP or related techniques.
As an exercise, compare the NTP (UDP port 123) and TIME (UDP port 37)
delays.
Steve Sommars
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