>       Even if the server is smart enough to wait as long as possible
> before putting the time stamp into the reply, having the whole system
> dependant on a potentially lengthy search through an on-disk
> authorization database is going to greatly increase the latency and
> jitter of the overall response, and greatly reduce the quality of
> time that can be served to those clients. 

Let me try again.

The client ends up with two time stamps from the server: one when the request 
arrives at the server, the other when the response leaves the server.

The server can insert an arbitrary delay in between those timestamps without 
degradation to the quality of time the client can maintain.  (Well, not 
longer than the poll interval.)  The time the packet sits on the server gets 
subtracted out.  It's not part of the latency or jitter that you see in ntpq.



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