Date: Mon, 05 Dec 2005 00:34:22 +0200 From: Alin-Adrian Anton <aanton@spintech.ro> To: freebsd-hackers@freebsd.org Subject: Re: cwnd and sstresh monitor Message-ID: <43936EEE.80309@spintech.ro> In-Reply-To: <4390F425.5060600@spintech.ro> References: <438F00D8.4040302@spintech.ro> <79722fad0512010559n29e957f5j47c99586ebbd3a0f@mail.gmail.com> <20051201150949.W56270@fledge.watson.org> <4390F425.5060600@spintech.ro>
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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 GPG keyID 0x183087BA (B129 E8F4 7B34 15A9 0785 2F7C 5823 ABA0 1830 87BA) gpg --keyserver pgp.mit.edu --recv-keys 0x183087BA "It is dangerous to be right when the government is wrong." - Voltaire
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