From: Juan Francisco Torreblanca (juan.torreblanca@tartec.com)
Date: 10/27/03
Subject: RE: tcptrace RTT time evolution Date: Mon, 27 Oct 2003 09:04:17 +0100 Message-ID: <CAC72BB3C3E1E245AB6084426EDCBCB819F2F7@tartessos.tartec.local> From: "Juan Francisco Torreblanca" <juan.torreblanca@tartec.com>
Hi,
If tcptrace graphs can generate RTT versus time I guess there is piece
of code that can be "re-used" (probably the most difficult one at less
for a tcptrace illiterate as me) in order to get raw RTT/time values in
a file.
Do you know if it is possible? And how would it be?
Rgds,
Juan Torreblanca.
PS I'm interested in your research; if possible I would like to have a
look at your paper once is published
-----Original Message-----
From: J Webb [mailto:jon_webb@binary-one.com]
Sent: Friday, October 24, 2003 8:55 PM
To: tcptrace@tcptrace.org
Subject: Re: tcptrace RTT time evolution
If you look at the xplot/jplot graphs that tcptrace can generate, you
can get a better understanding of retransmits (they are marked according
to time). The problem with this is that you don't get exact numbers for
them. I've done a lot of TCP over wireless research and in fact will
soon be publishing a paper on my work. I included the graph with
retransmits in my paper, but if you want raw numbers, I think you'll
have to hack it into the code.
Regards,
Jon Webb
Computer Communications Research Group
Baskin School of Engineering
University of California at Santa Cruz
Juan Francisco Torreblanca wrote:
> Hi all,
>
> I'm researching RTT, RTO and retransmission timer over wireless, I
> would like to plot RTO and retransmission timer evolution based on RTT
> samples.
>
> I'm capturing TCP data with Ethereal, and afterwards post processing
> them with tcptrace. So far, I've found the tcptrace option -lrZ which
> enable to have all raw RTT samples, but I would need to have a
> temporal reference of every RTT sample in order to plot them along
> with its relative time. Do you know if it is possible to do it with
> tcptrace? (Somehow to have the mentioned raw RTT samples files with
> time reference as well) Any other option in negative case?
>
> I would also need to know if tcptrace shows the number of
> retransmission timer expirations, I know it shows the number of
> retransmission packets but I would need to distinguish the
> retransmission due to timer expiration and packet loss detection (I
> mean retransmission trigger by fast transmission algorithm).
>
> Thanks in advance,
>
> Juan Torreblanca.
>
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