[ntp:hackers] NTP two-step on-wire protocol

David L. Mills mills at udel.edu
Mon Jul 23 02:41:41 UTC 2007


Warner,

Thanks; I hadn't thought about that. Howeve, in cases where this where 
the trailer timestamp (?) would be useful and the peers are using 
symmetric modes, I doubt that the peers will be under humungous load.

Dave

M. Warner Losh wrote:

> In message: <46A3C9EB.7080800 at udel.edu>
> "David L. Mills" <mills at udel.edu> writes:
> : Okay, the gauntlet is tossed. Can an output interrupt timestamp be
> : implemented in FreeBSD? I am completely incompetent in how best to
> : shoehorn such a thing in a politically correct way. Contrary to what I
> : said in a previous message, the only new feature required is this 
> timestamp.
>
> Yes. I'm sure that it can. I'd be happy to help you navigate the
> political minefield as well, since I know a thing or two about
> that... :-)
>
> There are some 'issues' here. The timestamp will be when the packet
> was transmitted. Depending on the NIC, one can queue up sequences
> packets to be sent, and only get an interrupt at the end, or when the
> transmit buffers have completely drained. It varies a lot by NIC
> chip.
>
> Warner




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