Alin-Adrian Anton wrote:
I used it now, and with a small patch it shows exactly what I need (seq,
ack, timestamp, cwnd and ssthresh). I just added my knob to trpt.c .
I also modified the iptime() function to provide microsecond resolution
instead of miliseconds, because most of the packets have the same
timestamp attached. Still, a decent number of packets have the same
timestamp. I'm looking at them only on one side of the connection (the
transmitter), I wonder if there is any better solution then timestamping
them on both sides - and mixing the values.
Thanks guys for the precious information, it helped a lot!
Actually the method above had issues, packets not being logged in the
debug buffer (which is limited and gets discarded quickly).
Using trpt -f did solve this problem, at the cost of duplicate entries.
So what finally did the job was a small "patch" of tcp_debug.c to print
on console and print only what is needed (FreeBSD 6.0 won't allow
"options TCPCONSDEBUG"), and /var/log/messages was parsed to extract the
values.
Cheers,
--
Alin-Adrian Anton
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"It is dangerous to be right when the government is wrong." - Voltaire
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