[asterisk-dev] IAX2 very CPU hungry

[Steve Kann]

Instead of speculating (registrations, some error in the call setup,  
etc), why doesn't the OP just run a quick oprofile profile on the  
machine in question, to see what is actually consuming his CPU  
resources?

If you find that the machine is spending 40% of it's time processing  
registrations, it will show up quite clearly  (well, a bit less  
clearly from the way I remember chan_iax2, with one huge socket_read 
() function, but the CPU time probably isn't there).  Similarly, if  
he's transcoding or such, and that is the major use of time, it will  
also show up.

-SteveK


On Nov 24, 2006, at 9:17 PM, Derek Smithies wrote:

>
> On Fri, 24 Nov 2006, Tim Panton wrote:
>>
>> IAX's repeated registrations every 30 seconds are know to be  
>> expensive.
>> Current thinking is to re-register much less often, but to use  
>> ping packets
>> to 'qualify' the link, which is more like SIP's standard method.
>
>
> Why are the registrations expensive ?
>  Does that suggest a bug in asterisk in handling registrations?
>  Can this code be made more efficient?
>
> Actually - there is a denial of service attack. I will adjust the  
> iax2 to
> send a registration every second, not every 30 seconds.
>  A couple of calls doing that will make the server quite busy.
>
>
> Derek.
>
> -- 
> Derek Smithies Ph.D.
> IndraNet Technologies Ltd.
> Email: derek at indranet.co.nz
> ph +64 3 365 6485
> Web: http://www.indranet-technologies.com/
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