[SR-Dev] what if ...

[Andrei Pelinescu-Onciul]

On May 20, 2009 at 19:24, Daniel-Constantin Mierla <miconda at gmail.com> wrote:
> Hello,
> 
> what would be the drawback of having sip_msg being all the time in 
> shared memory? Would pkg vs shm operations have relevant impact?

Yes.

> 
>  From personal observations, most of the requests (over 95%) end in TM 
> module (to absorb retransmission or to forward) where the sip_msg s 
> moved to shm. It would make things simpler for tm callbacks and related 
> routes (no need to move back/forward from/to pkg/shm). Parsing will 
> happen always once, as now cloning to shm in tm discards some parsed 
> headers, which may be needed in failure route or callbacks.

Havin a non-shm copy helps with locking and with moving cache lines
between cpus.

Andrei