[Kamailio-Users] UDP packet loss

[Alex R.S.M]

Hi,

As I mentioned in my previous email I am performing SIP to SIP performance testing using Kamailio proxy (UAC-Kamailio-UAC). 
After increasing the load to 300 calls/sec, Kamailio begins dropping UDP packets. (250 cps works fine). 
CPU  utilization and network bandwidth looks fine. 

- UDP packet size on the Linux server is increased to 8M:
net.core.rmem_max = 8388608

- the number of children used in Kamailio config increased to 16:
fork=yes
children=16


Here is there error I am getting in /var/log/syslog file: 

Feb 13 15:17:39 lab-linux01 /sbin/kamailio[12014]: ERROR:tm:new_t: out of mem
Feb 13 15:17:39 lab-linux01 /sbin/kamailio[12014]: ERROR:tm:t_newtran: new_t failed
Feb 13 15:17:39 lab-linux01 /sbin/kamailio[12024]: ERROR:tm:new_t: out of mem
Feb 13 15:17:39 lab-linux01 /sbin/kamailio[12024]: ERROR:tm:t_newtran: new_t failed


I am using 64M for the memory size (/etc/default/kamailio)
# Amount of memory to allocate for the running Kamailio server (in Mb)
MEMORY=64

Does it mean I need to increase this value?

Thanks,




> Date: Wed, 11 Feb 2009 18:26:49 +0200
> From: miconda at gmail.com
> To: alex_rsm at hotmail.com
> CC: users at lists.kamailio.org
> Subject: Re: [Kamailio-Users] UDP packet loss
> 
> Hello,
> 
> On 02/11/2009 05:43 PM, Alex R.S.M wrote:
> > hello
> >
> > > What are the number of children you have in config?
> > fork=yes
> > children=4
> this is a bit low if you want to manage high traffic. Try with 
> children=16 and see how the results are.
> 
> Cheers,
> Daniel
> 
> >
> > > Do you get any error messages in the syslog?
> > not getting any error message in /var/log/syslog
> >
> >
> > Thanks,
> > Ali
> >
> >
> > > Date: Wed, 11 Feb 2009 17:21:46 +0200
> > > From: miconda at gmail.com
> > > To: alex_rsm at hotmail.com
> > > CC: users at lists.kamailio.org
> > > Subject: Re: [Kamailio-Users] UDP packet loss
> > >
> > > Hello,
> > >
> > > On 02/11/2009 04:51 PM, Alex R.S.M wrote:
> > > > Hi,
> > > >
> > > > I am performing SIP to SIP performance testing using Kamailio proxy
> > > > (UAC-Kamailio-UAC). After increasing the load to 300 calls/sec
> > > > Kamailio begins dropping UDP packets. (250 cps works fine). CPU
> > > > utilization and network bandwidth looks fine. I think the bottleneck
> > > > is the Linux UDP buffer size of the proxy server. Here is the proxy
> > > > server information:
> > > kamailio autodetects and sets the buffer size to the maximum allowed.
> > > What are the number of children you have in config? Do you get any 
> > error
> > > messages in the syslog?
> > >
> > > Cheers,
> > > Daniel
> > >
> > > >
> > > > $ uname -a
> > > > Linux lab-linux01 2.6.24-19-server #1 SMP Wed Jun 18 14:44:47 UTC 
> > 2008
> > > > x86_64 GNU/Linux
> > > >
> > > > $ sudo sysctl -a | grep net.core.rmem_max
> > > > net.core.rmem_max = 131071
> > > >
> > > >
> > > > The question is if I increase the linux UDP buffer size do I need to
> > > > change any configuartion parameter (like MAX_RECV_BUFFER_SIZE) in
> > > > Kamailio?
> > > >
> > > > Thanks,
> > > > Alex R
> > > >
> > > >
> > > > 
> > ------------------------------------------------------------------------
> > > > Windows Live™: Keep your life in sync. See how it works.
> > > > 
> > <http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t1_allup_howitworks_022009> 
> >
> > > >
> > > > 
> > ------------------------------------------------------------------------
> > > >
> > > > _______________________________________________
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> > >
> > > --
> > > Daniel-Constantin Mierla
> > > http://www.asipto.com
> > >
> >
> > ------------------------------------------------------------------------
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> 
> -- 
> Daniel-Constantin Mierla
> http://www.asipto.com
> 

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