[Users] Delayed signalling?

[Max Gregorian]

Thanks very much for all the replies. I shall try and post a config and
traces as soon as I can get them from the office.

Some more information, if it helps:

Server specs:
- HP ProLiant DL360 G4 (1U rack servers)
- 3 GHz processors (800 MHz FSB)
- 1 GB RAM
- 10K rpm SCSI HDs (in a RAID 1+0 Mirror)

# Servers are running OpenSER 1.0.1 (no-TLS).
# Servers are listening on 3 ports (both tcp and udp for each port), so in
openserctl ps I am seeing 4 child processes for each port.
# Servers running CentOS Linux 4.3
# MySQL installed when CentOS was installed but *not* running and not
currently being used with Openser.


Things I have pretty much managed to eliminate are:
1. It's doesn't seem to be *hardware*. The specs for the servers are more
than sufficient I think.
2. It doesn't seem to be *traffic/load* related as I see these problems on 2
brand new servers I have just installed with no traffic on them. However, it
does seem to get worse with more traffic.
3. I don't think it's *database* related as I have deliberately not
configured *mysql* on any of the servers in case of database performance.
4.  I haven't played with the *timers* at all so far.
5. I haven't configured *nscd* yet, but as far as I can tell it's not
caching DNS.
6. Though openser is listening on tcp ports as well, currently only the udp
ports are being used as most of our customers use hardware phones. In any
case, I haven't as yet seen as requests on tcp.
7. I am not sure it is DNS as in the tests I ran I sent requests directly to
the external IP of the server and not to the domain name it is responsible
for. Also the test servers are now only responsible for one domain, but in
future will have more than one.
8. Also TTL on the domain name is really short. Ping from the server itself
TTL=64 and ping times are low as you would expect (< 1ms when pinging from
the server itself). Ping from outside the network (from the internet - for
me - tp the domain was) 12ms (average), no packet loss, TTL = 53.
9. I have not setup any internal DNS entries for the domain. Servers are
resolving domain from entries in /etc/hosts.

Like I said, it doesn't happen all the time - just maybe once or twice every
hour on the servers with more traffic.

I ran *SIPp* pointing at one of the new servers last week and at around
100CPS I was seeing about 2,000 out of approx. 10,000 calls were failing.
Setup was UAC -> openser -> UAS (Both UAC and UAS were running on the same
machine, but different ports). Again there is no traffic on these servers
now so I have no idea why so many failed calls.

I am not sure if any of this information helps, but I am certainly open to
suggestions on things to try.

Thanks in advance.



On 12/14/06, samuel <samu60 at gmail.com> wrote:
>
> It might be due to a DNS query....whenver a request has to be
> forwarded to a domain, openSER makes a DNS query to resolv the IP.
> During this operation, the child processing the request will not
> answer to further incoming messages.
>
> it also can be happening due to a spiral loop that stays on the server.
>
> Without further information (confg,logs) it's hard to tell which is
> the reason...
>
> hope it helps,
> Samuel.
>
> without more information
>
> 2006/12/14, Max Gregorian <gregorian442 at googlemail.com>:
> > Hi all,
> >
> > Just wondering if anyone else has had this problem. I have noticed while
> > tracing on my OpenSER server, that every now and then the server
> receives a
> > packet which it does to respond to immediately, resulting in a string of
> > packets being sent to the server and then the server responding a few
> > seconds later. This does not happen all the time, just say maybe once or
> > twice every hour. The rest of the time the signaling is correct and
> > responses follow request packets in the correct order.
> >
> > What I am trying to figure out is whether this is a load traffic issue (
> i.e.
> > can the server not handle too much load), and if so is it OpenSER or the
> > network or the server in general? I have run diagnostics on the servers
> and
> > there is nothing wrong with the hardware.
> >
> > On the other hand Could this be related to any timer issues? I remember
> > there was mention of timers in SER but are there any default timer
> settings
> > that can be tweaked?
> >
> > Thanks in advance for any response.
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users at openser.org
> > http://openser.org/cgi-bin/mailman/listinfo/users
> >
> >
> >
>
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