[Devel] tcp keepalive question

[Klaus Darilion]

Juha Heinanen wrote:
> Dan Pascu writes:
> 
>  > IMO, OpenSER's architecture is well suited for UDP clients and at most 
>  > some TCP/TLS peers. But even in this case if a peer is down and there are 
>  > many connection towards that peer, again many TCP workers will be 
>  > blocked, and other TCP peers cannot be handled meanwhile. 
> 
> dan,
> 
> how does this differ from the case where UDP UAS is down and does not
> respond and openser tm module keep re-sending the request until timeout
> occurs?

I guess the UDP retransmissions are not sent by the worker threads, but 
by a timer thread? And UDP sending is non-blocking.

With TCP, if a new connection is needed, the TCP connection will be set 
up by the worker thread. Thus, a new TCP connection can block all 
workers (just as a TLS handshake or DNS lookup)

Please correct me if I'm wrong.

regards
klaus


> 
> -- juha
> 
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-- 
Klaus Darilion
nic.at