[Devel] loop fix

[Bogdan-Andrei Iancu]

well, there is some truth here...

if you do transaction based detection, it will work only in stateful mode.
But as the guy suspected, the TM design helps a lot with the search as 
you need to look only on the hash table your requests matches.

I will have to go through the doc you mentions in order to get more ideas.

regards,
bogdan

Juha Heinanen wrote:

>i asked sip list, why the via the hash is needed for loop avoidance.  i
>got only one response that made any sense:
>
>  i can think of 3 common reasons you might want to place a hash in the Via as 
>  opposed to searching local transactions, which may or may not apply
>  depending on the implementation:
>
>  (1) speed - if you have a large number of active transactions, then it's 
>  almost certainly a lot faster to construct and compare a hash in X number of 
>  via headers than search all the transactions received on that particular 
>  transport.  any multi threaded design would require at minimum a read
>  lock on a list of transactions - doesn't sound to efficient to me!
>
>do you think that this is a valid concern for openser, i.e., does it
>take too long to find out if a pending transaction with a certain
>call-id/r-uri already exists?
>
>-- juha
>
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