[asterisk-users] Asterisk 1.2.24 simultaneous call limits.

[James Texter]

What do you have ulimit -n and ulimit -x set to?

Thanks,

James Texter

On Fri, 2007-09-21 at 08:51 -0400, Wai Wu wrote:

> I am not so sure if the interrupts has any thing to do with it. I run some more test just now and I am getting these error on the console of the call receiving machine. All it does is wait for 45 seconds. I think there is more can be done on the Linux configuration, but I just don't know what.
> 
> Sep 21 08:42:30 WARNING[22820]: channel.c:565 ast_channel_alloc: Channel allocation failed: Can't create alert pipe!
> Sep 21 08:42:30 WARNING[22820]: chan_sip.c:2797 sip_new: Unable to allocate SIP channel structure
> Sep 21 08:42:30 NOTICE[22820]: chan_sip.c:10843 handle_request_invite: Unable to create/find channel
> Sep 21 08:43:03 WARNING[22820]: channel.c:565 ast_channel_alloc: Channel allocation failed: Can't create alert pipe!
> Sep 21 08:43:03 WARNING[22820]: chan_sip.c:2797 sip_new: Unable to allocate SIP channel structure
> Sep 21 08:43:03 NOTICE[22820]: chan_sip.c:10843 handle_request_invite: Unable to create/find channel
> 
> 
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com on behalf of Gordon Henderson
> Sent: Fri 9/21/2007 3:40 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] Asterisk 1.2.24 simultaneous call limits.
>  
> On Thu, 20 Sep 2007, Wai Wu wrote:
> 
> >
> > Hi everyone,
> >
> > I am running into wall today with simultaneous call limits. I have two
> > Asterisk machines (fast 3GHz C2D with 2GB of ram). I tried to create a
> > lot of sip calls from one machine to the other by issuing AMI Originate
> > commands to one machine. The machine that makes calls plays a message
> > (demo-intruct) upon the other machine answer. The machine receives the
> > calls just waits for 40 seconds then hangs up. Throught the manager
> > connection, I was creating 10 calls per-second. I also have sip phone
> > registered with the calling machine. At around 150 to 200 calls. When I
> > call the machine that's making all the calls, most of the calls couldn't
> > go through. For the ones that went through, most of them will drop off
> > within seconds of the call. But here is catch. When I run 'top', the cpu
> > is idling 97%. My question is. Is there a limit on the number of
> > simultaneous calls Asterisk can handle? I know I have very fast systems.
> > Shouldn't they be able to handle that many calls? What is your take?
> 
> 200 calls using g711 needs 16Mb/sec of network bandwidth - each way. (200 
> * 80Kbs) This is well within the limits of a 100Mb network interface.
> 
> However it also needs 50 packets per second of 160 bytes + IP overhead 
> each way, per call, so thats 20,000 packets/second, and that might well be 
> the bottleneck for your system, not just in the hardware issues required 
> to shovel that many packets over the various buses, but the Linux overhead 
> of schedulling each of the 200 threads to take/send that data in 
> real-time.
> 
> You might want to run iperf on each machine with nothing else going and 
> see just how many UDP packets of 160 bytes you can push between the 
> machines before packet loss starts.
> 
> Gordon
> 
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