21 May
2009
21 May
'09
2:31 a.m.
On May 20, 2009 at 19:24, Daniel-Constantin Mierla <miconda(a)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