From: J Webb (jon_webb@binary-one.com)
Date: 10/24/03
Message-ID: <3F997590.7070307@binary-one.com> Date: Fri, 24 Oct 2003 11:55:12 -0700 From: J Webb <jon_webb@binary-one.com> 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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