09-04-2013
To assist us in this, try breaking the problem up a bit - I can't spek fo the others here but I'm reluctant to expend a bunch of energy understanding how that packet dump format works and what the chain of events should be.
What specific questions do you have?
Are you having trouble making a script that identifies which lines in the output make up one 'conversation'? (If so, list what one conversation would look like and then show it in the larger output)
Are you having trouble scripting the maths to calculate the time differences? (If so, show exactly what values you are trying to perform the maths on).
Sorry I can't help more yet but you should find plenty of assistance once the problem is more clear.
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LEARN ABOUT FREEBSD
selwakeup
SELRECORD(9) BSD Kernel Developer's Manual SELRECORD(9)
NAME
seldrain, selrecord, selwakeup -- record and wakeup select requests
SYNOPSIS
#include <sys/param.h>
#include <sys/selinfo.h>
void
seldrain(struct selinfo *sip);
void
selrecord(struct thread *td, struct selinfo *sip);
void
selwakeup(struct selinfo *sip);
DESCRIPTION
seldrain(), selrecord() and selwakeup() are the three central functions used by select(2), poll(2) and the objects that are being selected
on. They handle the task of recording which threads are waiting on which objects and the waking of the proper threads when an event of
interest occurs on an object.
selrecord() records that the calling thread is interested in events related to a given object. If another thread is already waiting on the
object a collision will be flagged in sip which will be later dealt with by selwakeup().
selrecord() acquires and releases sellock.
selwakeup() is called by the underlying object handling code in order to notify any waiting threads that an event of interest has occurred.
If a collision has occurred, selwakeup() will increment nselcoll, and broadcast on the global cv in order to wake all waiting threads so that
they can handle it. If the thread waiting on the object is not currently sleeping or the wait channel is not selwait, selwakeup() will clear
the TDF_SELECT flag which should be noted by select(2) and poll(2) when they wake up.
seldrain() will flush the waiters queue on a specified object before its destruction. The object handling code must ensure that *sip cannot
be used once seldrain() has been called.
The contents of *sip must be zeroed, such as by softc initialization, before any call to selrecord() or selwakeup(), otherwise a panic may
occur. selwakeup() acquires and releases sellock and may acquire and release sched_lock. seldrain() could usually be just a wrapper for
selwakeup(), but consumers should not generally rely on this feature.
SEE ALSO
poll(2), select(2)
AUTHORS
This manual page was written by Chad David <davidc@FreeBSD.org> and Alfred Perlstein <alfred@FreeBSD.org>.
BSD
August 25, 2011 BSD