big improvement in BIND9 auth-server startup time

Doug Barton dougb at
Tue Aug 9 18:33:23 UTC 2011

On 08/09/2011 11:17, J. Thomsen wrote:
> On Tue, 9 Aug 2011 17:18:13 +0000,Evan Hunt <each at> wrote:
>>> The master now loaded about 650 zones/sec.
>>> The slave did not change from the usual 120 zones/sec.
>> I'm purely guessing, but I wonder if there's some rate-limiting
>> due to the SOA queries slaves have to send to their masters.
> You are probably right.
> Increasing 
> transfers-in/out 
> transfers-per-ns
> serial-query-rate
> on both master and slave improved the slave load time considerably to 577 zones/sec.
> Which one is the important one to increase, I don't know.

Assuming that the zones were mostly up to date, it was serial-query-rate.

Also, FYI, you're getting pretty close to the point where the
master/slave configuration is going to become a bottleneck. If you plan
to grow much beyond this point you should start looking at making all of
your systems masters and using an out of band method to update the zones.




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