[Ns-bugs] [Bug 253] ARP does not retry upon loss

[bugzilla-daemon@nsnam-www.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=253





------- Comment #7 from craigdo at ee.washington.edu  2008-07-21 13:20 -------
> > 3) use a per-cache timer 
[ ... ]

> > I really prefer 3 above.

> I would be fine with this, thanks.

When I initially thought about the problem I came to the conclusion that a
per-cache timer would be best; but when I looked at Linux I found per-entry
timers.

I believe the primary reason you would swallow this overhead is to avoid a
"thundering herd" of retries which you could get if you scanned the entire
cache on a single timer expiration; especially if we were to someday start
aging the entries in the cache.

Since our default position is to do it like Linux, I thought multiple timers
were were expensive but justifiable.


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