>> I don't think the I/O waits are important.  We need to work
>> correctly when the server is overloaded.
> Serious question: how often does this actually happen? I want to get a feel
> for scale. 

The NIST servers have a long tradition of being overloaded.

There was a graph recently on the pool list, showing huge spikes on the hour.
  http://leobodnar.com/files/100Mb-peak-NTP-pool.png


> 2. On the next send, adjust the timerstamp by the average of all previous
> ones. 

I can think of a couple of mechanisms that would generate outliers.  So I'd 
modify that with something like "Try again if it's too far off".  (Which 
assumes you are checking before actually sending.)


-- 
These are my opinions.  I hate spam.



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