How does Linux do RTTM?

[John Richard Moser <nigelenki@comcast.net>]

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How does Linux do RFC 1323 style RTTM measurement?  Is there a
pseudo-clock used i.e. number of jiffies since boot?  Or just a
real-time timestamp?

Sorry for the dumb questions but Google is being massively bad at "tell
me about an obscure feature of the Linux kernel that nobody cares about"
today :)

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