tcptrace-bugs Average Segment Size

From: Robert Dann (rjd1@dcs.qmul.ac.uk)
Date: 01/27/06 

Message-Id: <01B841E4-5F3B-4BA4-B279-AE81CEA5C211@dcs.qmul.ac.uk>
From: Robert Dann <rjd1@dcs.qmul.ac.uk>
Subject: tcptrace-bugs Average Segment Size
Date: Fri, 27 Jan 2006 12:36:32 +0000

The average segment size on the left and right hand side appears to
be wrong here. With a max and min segment size equal, surely the
average is the same?

a->b: b->a:
      total packets: 6 total
packets: 4
      ack pkts sent: 5 ack pkts
sent: 4
      pure acks sent: 3 pure acks
sent: 0
      sack pkts sent: 0 sack pkts
sent: 0
      dsack pkts sent: 0 dsack pkts
sent: 0
      max sack blks/ack: 0 max sack blks/
ack: 0
      unique bytes sent: 273 unique bytes sent:
194
      actual data pkts: 1 actual data
pkts: 1
      actual data bytes: 273 actual data bytes:
194
      rexmt data pkts: 0 rexmt data
pkts: 1
      rexmt data bytes: 0 rexmt data
bytes: 1
      zwnd probe pkts: 0 zwnd probe
pkts: 0
      zwnd probe bytes: 0 zwnd probe
bytes: 0
      outoforder pkts: 0 outoforder
pkts: 0
      pushed data pkts: 1 pushed data
pkts: 1
      SYN/FIN pkts sent: 1/1 SYN/FIN pkts sent:
1/2
      req 1323 ws/ts: Y/Y req 1323 ws/ts:
Y/N
      adv wind scale: 0 adv wind
scale: 0
      req sack: Y req
sack: N
      sacks sent: 0 sacks
sent: 0
      urgent data pkts: 0 pkts urgent data
pkts: 0 pkts
      urgent data bytes: 0 bytes urgent data
bytes: 0 bytes
      mss requested: 1360 bytes mss requested:
1460 bytes
      max segm size: 273 bytes max segm size:
194 bytes
      min segm size: 273 bytes min segm size:
194 bytes
************************
      avg segm size: 272 bytes avg segm size:
193 bytes
*************************
      max win adv: 6432 bytes max win adv:
61440 bytes
      min win adv: 5440 bytes min win adv:
61440 bytes
      zero win adv: 0 times zero win
adv: 0 times
      avg win adv: 6035 bytes avg win adv:
61440 bytes
      initial window: 273 bytes initial window:
194 bytes
      initial window: 1 pkts initial
window: 1 pkts
      ttl stream length: 273 bytes ttl stream length:
194 bytes
      missed data: 0 bytes missed
data: 0 bytes
      truncated data: 0 bytes truncated
data: 0 bytes
      truncated packets: 0 pkts truncated
packets: 0 pkts
      data xmit time: 0.000 secs data xmit time:
0.000 secs
      idletime max: 171.3 ms idletime max:
173.1 ms
      throughput: 828 Bps throughput:
588 Bps

Rob Dann
rjd1@dcs.qmul.ac.uk

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