summing tcp.time_delta

[Stuart Kendrick <skendric () fhcrc org>]

I have a trace of a client loading a large file via HTTP from a remote
Web server, captured at the client.  Takes ~7.5s.

I was imagining that I could calculate how much time the client
contributed to the transaction and compare this to how much time the
server + network contributed.  But I'm fumbling the calculation somehow
... I get the same result (~7.5s) regardless of whether I'm filtering on
client-sourced frames or server-sourced frames.  I would have expected
the 7.5s to be divided between the two (~.5s for tcp.dstport==80 and ~7s
for tcp.srcport==80).  Tips?

C:\Temp> tshark -nlr client.pcap -o tcp.calculate_timestamps:TRUE -R
"(tcp.dstport==80)" -qz io,stat,600,"SUM(tcp.time_delta)tcp.time_delta"

 

============================================

| IO Statistics                            |

|                                          |

| Interval size: 7.572 secs (dur)          |

| Col 1: SUM(tcp.time_delta)tcp.time_delta |

|------------------------------------------|

|                |1         |              |

| Interval       |    SUM   |              |

|---------------------------|              |

| 0.000 <> 7.572 | 7.571759 |              |

============================================

C:\Temp>tshark -nlr client.pcap -o tcp.calculate_timestamps:TRUE -R
"(tcp.srcport==80)" -qz io,stat,600,"SUM(tcp.time_delta)tcp.time_delta"

 

============================================

| IO Statistics                            |

|                                          |

| Interval size: 7.572 secs (dur)          |

| Col 1: SUM(tcp.time_delta)tcp.time_delta |

|------------------------------------------|

|                |1         |              |

| Interval       |    SUM   |              |

|---------------------------|              |

| 0.000 <> 7.572 | 7.571759 |              |

============================================


--sk


Stuart Kendrick
FHCRC

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