[ntp:questions] Client doesn't drop failed source

Danny Mayer mayer at ntp.org
Sun Feb 7 04:29:54 UTC 2010


David Woolley wrote:
> E-Mail Sent to this address will be added to the BlackLists wrote:
> 
>>
>> I can perhaps see idling the connection to keep it open when the
>>  poll rate is at ~ 1 minute, however what about when the poll
>>  rate decreases to ~ 17 minutes? (or less often if so configured)
> 
> There are no network cost in keeping a TCP connection "idling", as there
> is no traffic in that state.  (The exception is if you enable
> keepalives, and you wait hours between real traffic, but even then the
> traffic is very very small.)

While there may be no network costs, it a major cost to the server which
not only uses up member holding it open but also consumes a file
descriptor which are of limited supply.

Danny


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