[asterisk-users] Scaling

[Steve Totaro]

On Wed, Jun 17, 2009 at 7:41 PM, Steve Totaro <
stotaro at totarotechnologies.com> wrote:

>
>
> On Wed, Jun 17, 2009 at 3:18 PM, John Todd <jtodd at digium.com> wrote:
>
>>
>> On Jun 17, 2009, at 8:16 AM, Steve Totaro wrote:
>>
>> > Hi,
>> >
>> > Quick question to the real world.
>> >
>> > Approx what specs would I need on server to handle 95 ZAP or Dahdi -
>> > > SIP gateway using G729 on the SIP to carrier side (nothing else,
>> > just media conversion)?
>> >
>> > Does the latest Asterisk/DAHDI significantly improve these numbers
>> > over say, Asterisk 1.2.X?
>> >
>> > Sure, there is plenty to read but nothing I could find quickly on my
>> > exact needs that was clear and I want to be fairly sure before
>> > ordering a server.
>> >
>> > Obviously load avg has something to do with it but CPU and mem seems
>> > to be the biggest factors.
>> >
>> > --
>> > Thanks,
>> > Steve Totaro
>> > +18887771888 (Toll Free)
>> > +12409381212 (Cell)
>> > +12024369784 (Skype)
>>
>>
>> [Digium hat off, ITSP (previous employer) hat on.]
>>
>> Not speaking for Digium on this one, but speaking from personal
>> experience at another company.
>>
>> We could get 100 G.729 channels in a 2x3ghz P4 machine with plenty of
>> CPU room to spare, 4+ years ago, and that rule of thumb served us
>> well.  This was for SIP (G.711<->G.729) but I can't imagine that DAHDI
>> or Asterisk takes significantly more or less horsepower for this task
>> now for the base transcoding load.
>>
>> JT
>>
>> ---
>> John Todd                       email:jtodd at digium.com<email%3Ajtodd at digium.com>
>> Digium, Inc. | Asterisk Open Source Community Director
>> 445 Jan Davis Drive NW -  Huntsville AL 35806  -   USA
>> direct: +1-256-428-6083         http://www.digium.com/
>>
>>
>>
>>
> John,
>
> Thanks for the info.
>
> Can't go wrong with these in a cluster if you are correct.
> http://www.surpluscomputers.com/348663/hp-dl140-proliant-dual-xeon.html
>
> I used to have a garden of seven (too small to be a farm) of Asterisk boxen
> that were simple PRI to SIP gateways doing ulaw (no transcoding as far as
> codec), and nothing else running, just a few lines in each conf file.
>
> They would run at ~65% CPU utilization with 95 channels in use on each box.
>
> This was the Asterisk, Zaptel, Libpri 1.2.X flavor.
>
> I wonder if anyone else has input on the CPU utilization of of a simple
> PSTN <-> VoIP gateway based on Asterisk?
>
>
I wonder how much of my observed 65% CPU utilization was because of software
echo cancellation?

If someone knows, I would appreciate any input.  If not, I will follow-up
with my own testing in this thread.

-- 
Thanks,
Steve Totaro
+18887771888 (Toll Free)
+12409381212 (Cell)
+12024369784 (Skype)
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