Problem in Performance test

[RunxiaWan]

Hi all,
I am doing performance test for my company's resolver with BIND 9.10.3 and
find something weird. The test client and resolver are in the same LAN. When
I use a small set of domain as an input with a 10000 per second query
sending rate, everything looks reasonable. However, when I use a set of
thousands of domains as an input, The QPS is unexpectedly low and the
latency is high. Here is the result from DNSperf:

	Statistics:
	
  Queries sent:         11823
  Queries completed:    11823 (100.00%)
  Queries lost:         0 (0.00%)

  Response codes:       NOERROR 9883 (83.59%), SERVFAIL 242 (2.05%),
NXDOMAIN 1698 (14.36%)
  Average packet size:  request 48, response 203
  Run time (s):         69.891567
  Queries per second:   169.162039

  Average Latency (s):  0.519502 (min 0.003766, max 211.981919)
  Latency StdDev (s):   1.423057

And when I decreased the query sending rate to 100 per second, the latency
decrease as the same when I use small set of domain as an input. Here is the
result from DNSperf:

	Statistics:

  Queries sent:         6000
  Queries completed:    6000 (100.00%)
  Queries lost:         0 (0.00%)

  Response codes:       NOERROR 4995 (83.25%), SERVFAIL 37 (0.62%), NXDOMAIN
968 (16.13%)
  Average packet size:  request 54, response 211
  Run time (s):         62.789257
  Queries per second:   95.557748

  Average Latency (s):  0.083028 (min 0.005266, max 134.543920)
  Latency StdDev (s):   0.568863

Anyone knows any explanation for this? Thanks.




---------------
Runxia Wan(Brian)
Research Engineer
BII Lab
Beijing Internet Institute(BII)
rxwan at biigroup.cn



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/bind-users/attachments/20160115/f9cc36a7/attachment.html>