[asterisk-dev] IAX2 very CPU hungry

[Anton]

PC's talks to each other, so there must not be lots of 
registrations. Lots of calls, yes, THey both have minimum 
2xE1 PRI with traffic they exchange via IAX or SIP

On 25 November 2006 09:16, Steve Kann wrote:
> 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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