Hallo all,
As we recently took up some SIP-performance testing again and since our
tests in the past the -trace_rtt option was added, we compared the
measurement results obtained using three different methods:
-trace_stat option which prints out global statistics about all calls.
-trace_rtt which prints out more detailed statistics about each
individual call
- a network capture using Wireshark
Our test-setup was the following:
- switched network
- dual core intel machines running at 2.8Ghz
- Read Hat Linux Enterprise Edition installed
- a call rate of 100 caps, 2 SIPp's directly communicating, UDP
- a slightly modified uac and uas scenario: actually the scenario's are
the default, but we increased the response-time repartition and
call-lenght repartition granularity to 1 ms
(<ResponseTimeRepartition value="1,2,3,4,5,6,7,8,9,10,11,12,...,300/>)
The measured results are as follows:
trace_stat:
<1 : 19606
<2 : 2559
<3 : 1
<4 : 1
(average: 0.615)
[ (19606*0.5 + 2559*1.5 + 2.5 + 3.5)/22167]
trace_rtt:
<1 : 0
<2 : 6948
<3 : 15207
<4 : 10
<5 : 1
<6 : 1
average: 2.187
pcap:
<1 : 22043
<2 : 3
<3 : 10
<4 : 111
average: 0.729
So we notice a very big difference between the output of -trace_stat and
-trace_rtt. The output from the Wireshark trace and -trace_stat seems
to be more in line. Especially considering there is already some
processing done by the time SIPp gets its hands on the packet.
Is this an expected result? The difference between the -trace_rtt
output and trace_stat seems very large. Although I initially expected
that the trace_rtt output would allow us to get more detailed diagnostic
results.
Another odd result is that although Wireshark reports 111 messages to
arrive later than 3ms, nor trace_rtt nor -trace_stat seem to detect this.
Has anyone else noticed this behavior? And is it to be expected or do
you think it can be fixed?
Kind Regards,
Bruno
--
Bruno Van Den Bossche
[EMAIL PROTECTED]
http://www.ibcn.intec.UGent.be
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