[Pdns-users] Limit on TCP querys.

Peter van Dijk peter.van.dijk at netherlabs.nl
Mon Dec 5 06:17:26 UTC 2011

Hi Grant,

On Dec 4, 2011, at 21:44 , Grant Keller wrote:

> On 12/03/2011 10:40 AM, Peter van Dijk wrote:
>> Hello Grant,
>> On Dec 3, 2011, at 1:14 , Grant Keller wrote:
>>> When I run a large number of querys against my PDNS 3.0 auth server, I am seeing a number of timeouts on my querys. For example, if I run 19000 tcp querys at 5-6 querys per second, I end up with about 400 querys failed due to timeouts.  Most of the time outs occur in batches, where I see all querys or every other query timeout. Is that simply too many tcp querys for PDNS to handle?
>> Depending on how you are doing this, you may be hitting the max-tcp-connections default, which is 10. If you want to do lots of TCP queries, I suggest increasing max-tcp-connections a lot.
>> Kind regards,
>> Peter van Dijk
> The max-tcp-connection was set to 1000, and figured that would be high enough, should I increase the limit further?

1000 sounds like it should be enough. Can you share how you are running these queries? And is PowerDNS logging anything during your tests, especially around times of failure?

Kind regards,
Peter van Dijk

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