Wireshark-bugs: [Wireshark-bugs] [Bug 8721] -z icmp,srt stalls intermittently
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 27 May 2013 03:45:30 +0000

Comment # 1 on bug 8721 from 
Ah, this just finished.

tshark -r pings-big.pcap -qz icmp,srt

==========================================================================
ICMP Service Response Time (SRT) Statistics (all times in ms):
Filter: <none>

Requests  Replies   Lost      % Loss
962848    962720    128         0.0%

Minimum   Maximum   Mean      Median    SDeviation     Min Frame Max Frame
0.003     570.535   5.094     0.275     24.703         27209     1606049   
==========================================================================

Took 7.5 hours

I tried slicing pings-big.pcap into 50MB chunks (with a ~14MB remainder file)
and running tshark serially against them:
slice1.pcap:  18 minutes
slice2.pcap:  18 minutes
slice3.pcap:  18 minutes
slice4.pcap:  17 minutes
slice5.pcap:   1 minute

I would have predicted that running tshark against the ~220MB pings-big.pcap
would have taken the sum of the slices, i.e. 18+18+18+17+1 = 72 minutes

So, this is not a bug at all, merely unexpected non-linear performance.

I will go ahead and report it, though, just in case this seems worthy of
attention.

--sk

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