Wireshark-bugs: [Wireshark-bugs] [Bug 2054] New: RTT values (tcp.analysis.ack_rtt) not accurate
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 30 Nov 2007 21:03:35 +0000 (GMT)
http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2054

           Summary: RTT values (tcp.analysis.ack_rtt) not accurate in
                    advanced io graph
           Product: Wireshark
           Version: 0.99.7
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Medium
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: ed.staszko@xxxxxxxxxxxxxxxxx


Build Information:
Version 0.99.7pre1 (SVN Rev 23530)

Copyright 1998-2007 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled with GTK+ 2.12.1, with GLib 2.14.3, with WinPcap (version unknown),
with libz 1.2.3, with libpcre 6.4, with SMI 0.4.5, with ADNS, with Lua 5.1,
with
GnuTLS 1.6.1, with Gcrypt 1.2.3, with MIT Kerberos, with PortAudio PortAudio
V19-devel, with AirPcap.

Running on Windows XP Service Pack 2, build 2600, with WinPcap version 4.0.2
(packet.dll version 4.0.0.1040), based on libpcap version 0.9.5, without
AirPcap.

Built using Microsoft Visual C++ 6.0 build 8804

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
The values derived in the Advanced io Graph, using the tcp.analysis.ack_rtt,
are inaccurate. When compared with Ethereal, they vary greatly, including
Wireshark having values for RTT's to previous TCP acknowledgements-only and
including user wait times in the calculations.
This has been an extremely valuable tool for measuring how the QOS is
functioning, by filtering graphs on different TCP ports and comparing RTT's.
This was written up previously as a bug, because it was not functioning at all.
 It is now functioning, but has inaccurate data. 
Any attention would be appreciated so we don't have to go between Ethereal and
Wireshark depending on whether we are looking for better decodes or better
RTT's.


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