[dns-operations] 86198 queries per second from BIND 9

[Olaf M. Kolkman]

>
> I would be very interested to hear about other peoples experience  
> of load
> testing nameservers on this and other hardware. Any questions and
> suggestions for other tests as also welcome.


Hi John,

At NLnet Labs we  have a testlab called DISTEL that uses real-time  
queries and fires them against an authoritative server[*]. The speed  
at which these traces are replayed is varied to simulate higher query  
rates. Since we capture the traces on the listener we are able to do  
both performance as well as perform regression testing on the answers  
(which was one of the main reasons to build the lab in the first place).

The experiments using a root-zone and a root-trace towards a 1.6Ghz  
Athlon single CPU on a 100Mb/s network is in the attached plot. In  
the plot you can see the percentage of dropped packets against the  
number of queries per second. The green line (echo) is the response  
of a small server that just echos the incoming packet. Essentially  
that is what the stack can do most efficiently.

One think I would like to know about your measurements is the amount  
of packages dropped according to queryperf. I am not sure if  
queryperf will try to figure out the sweet spot where the answer rate  
is maximized while the drops are still zero.

Obviously I would be more than interested to see a test with NSD on  
your hardware with queryperf or netperf besides we are more than  
happy to test other implementations in our setup as well.


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At this moment we are upgrading the lab to use a dual 1.6Gb Pentium  
processor box and a 1 Gb network. We are hitting some sort of barrier  
and we are not sure if it is the network interface.

--Olaf


[*] http://www.ripe.net/docs/ripe-352.html#sec:lab for a description  
or the lab and the methodology.

-----------------------------------------------------------
Olaf M. Kolkman
NLnet Labs
http://www.nlnetlabs.nl/



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