Date: Mon, 2 Feb 1998 10:10:25 +0100 From: Igor.Alekseev@kjeller.fou.telenor.no To: freebsd-hackers@FreeBSD.ORG Subject: help with real time monitoring of TCP control variables Message-ID: <"1268 98/02/02 10:10*/G=Igor/S=Alekseev/OU=kjeller/O=fou/PRMD=telenor/ADMD=TELEMAX/C=no/"@MHS>
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Hi, I am doing network performance evaluations with FreeBSD 2.2.5 with ENI ATM card, using HARP atm software. Is it possible to do the real time monitoring (by real time I mean synchronised with tcpdump output) of TCP connection control variables for a particular connection, such as SND.NXT, CWND, SSTHRESH, RTT estimate? Is there a standard mechanism for doing this kind of thing or is some source code change required of tcp code? In any case, could anyone, please give me a hint on the best way to do it? What I need - is basically dumping the above variables into a file along with timestamp, say every time a segment is received or sent. It does not have to be anything extremely versatile, just quick and easy hack will suffice for the time being. By looking at the archives of this list, I found that such discussion was held 2.5 years ago, but I did not find any definite answer to the question posed. Maybe things have changed since then? Thanks in advance, Igor V. Alekseev Visiting reseacher, Telenor, Norway
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