Basic bind capacity question

Mike Toler mike.toler at
Wed Jul 18 19:32:48 UTC 2007

I'm just trying to get some basic capacity ratings for my Bind 9.4 DNS
Server setup, and I think I must be doing something wrong.
No matter how many threads I have attempting to perform lookups (even
spread across multiple machines) I'm seeing throughput of approximately
30 DNS lookups per second.  That seems ridiculously small to me.

It also seems like I can only have around 5 simultaineous queries (i.e.
if I spawn any more than 5 threads, the extra ones timeout).  

If I run one thread, I can get 30 DNS lookups per second.  If I run 2
threads, I get about 15. yada-yada.

I can even spread the threads over multiple machines, and they still
only total up to about 30 lookups per second.

My DNS server is a 4-CPU/1.6 ghz machine with about 16 gig of ram.

Michael Toler
System Test Engineer
Prodea Systems, Inc.
214-278-1834 (office)
972-816-7790 (mobile)

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