Wireshark-bugs: [Wireshark-bugs] [Bug 7085] Buildbot crash output: fuzz-2012-04-14-9084.pcap

Date: Tue, 17 Apr 2012 10:41:04 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7085

Evan Huus <eapache@xxxxxxxxx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #35 from Evan Huus <eapache@xxxxxxxxx> 2012-04-17 10:41:04 PDT ---
(In reply to comment #34)
> 1. adding new conversations is _fast_ because the frames have increasing frame
> number (even though merging files may turn out to be slow)
> 2. looking up conversations is _slow_ because the function
> conversation_lookup_hashtable() has to traverse the chain list for each and
> every frame...
> 
> my proposal: cache the last found conversation; store it into the hash chain
> list head (it gets 10 times faster or maybe even more). I have a patch for it.
> new bug report?

Yes a new bug report ('enhancement' priority) would be appropriate. If you
could attach your test captures (or host them somewhere else and provide a
link) on the new report, that would be good too.

I'm a bit surprised though - my expectation would be that for sane captures,
conversation_lookup_hashtable() would be able to skip to the end of the list
using the 'last' pointer just like adding new conversations does. The code is
there in conversation_lookup_hashtable(), so I'm curious why it's not being
exercised.

We can continue this conversation on the new bug.

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