Hallo Rico,
die Doku beim ISC sagt:
clients-per-query, max-clients-per-query
These set the initial value (minimum) and maximum number of recursive
simultanious clients for any given query (<qname,qtype,qclass>)
that the server will accept before dropping additional clients.
named will attempt to self tune this value and changes will be
logged. The default values are 10 and 100.
This value should reflect how many queries come in for a given
name in the time it takes to resolve that name. If the number of
queries exceed this value, named will assume that it is dealing
with a non-responsive zone and will drop additional queries. If
it gets a response after dropping queries, it will raise the estimate.
The estimate will then be lowered in 20 minutes if it has remained
unchanged.
"time it takes to resolve" könnte man im Sinne von forwarder interpretieren,
muss man aber nicht.
Interessant ist, dass ich auf 3 NS zugreifen kann, die vergleichbar sind und
nur einer hat das "Problem", dieser logt dann auch fleißig sein Autotuning:
14-Mar-2012 07:48:00.911 resolver: notice: clients-per-query increased to 15
14-Mar-2012 08:08:00.911 resolver: notice: clients-per-query decreased to 14
14-Mar-2012 08:13:00.858 resolver: notice: clients-per-query increased to 19
14-Mar-2012 08:33:00.858 resolver: notice: clients-per-query decreased to 18
14-Mar-2012 08:53:00.858 resolver: notice: clients-per-query decreased to 17
14-Mar-2012 09:13:00.858 resolver: notice: clients-per-query decreased to 16
14-Mar-2012 09:23:00.664 resolver: notice: clients-per-query increased to 15
14-Mar-2012 09:38:00.768 resolver: notice: clients-per-query increased to 15
14-Mar-2012 09:58:00.768 resolver: notice: clients-per-query decreased to 14
14-Mar-2012 10:18:00.768 resolver: notice: clients-per-query decreased to 13
14-Mar-2012 11:43:00.745 resolver: notice: clients-per-query increased to 15
14-Mar-2012 11:48:01.788 resolver: notice: clients-per-query increased to 20
14-Mar-2012 12:08:01.788 resolver: notice: clients-per-query decreased to 19
14-Mar-2012 12:28:01.788 resolver: notice: clients-per-query decreased to 18
Da die Doku in den defaults aber von 10 und 100(bei max*) spricht, sind das
hier ja noch keine Panikwerte ...
Mit freundlichen Grüßen / Kind regards
Ronny Seffner
--
Ronny Seffner | Alter Viehweg 1 | 01665 Triebischtal
www.seffner.de | [email protected] | +49 35245 72950
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