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

Frank Kardel kardel at ntp.org
Mon Jul 23 02:58:00 UTC 2007


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... :-)
>   
Good - I can offer help from the NetBSD project side here.
> 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
>   
Frank


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