[Asterisk-biz] $19.95/mo unlimited US IAX termination

[Mike Taht]

Here's a comparison of the various codecs on a 533 Mhz Xscale. This is
with speex 1.1.7, with fixed point and arm assembly enabled... I was
pleased to see that the other codecs, besides speex, scale roughly
comparable with clock vs a vs the P4....

         g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
   g723     -     -     -     -     -     -     -     -     -     -     -
    gsm     -     -     8     8    19     8     7     -     -   166     -
   ulaw     -    15     -     1    13     2     1     -     -   160     -
   alaw     -    15     1     -    13     2     1     -     -   160     -
   g726     -    24    11    11     -    11    10     -     -   169     -
  adpcm     -    15     2     2    13     -     1     -     -   160     -
   slin     -    14     1     1    12     1     -     -     -   159     -
  lpc10     -     -     -     -     -     -     -     -     -     -     -
   g729     -     -     -     -     -     -     -     -     -     -     -
  speex     -    35    22    22    33    22    21     -     -     -     -
   ilbc     -     -     -     -     -     -     -     -     -     -     -


On Apr 11, 2005 10:03 PM, Michael Giagnocavo <mgg-digium at atrevido.net> wrote:
> >On Fri, 2005-04-08 at 09:33 -0500, Brian West wrote:
> >> Speex is a CPU whore.  Even more so than g729.
> >
> >How much of a whore are we talking about here? Clock cycles are cheap,
> >so if I can get 7 channels of speex with a dual 900Mhz PIII (my current
> >system) I'd say it's worth the savings in bandwidth.
> >
> >FWIW, I just spoke to VoicePulse and their engineering department said
> >they will support Speex with IAX termination within 1 to 2 days.
> >
> >-lee
> 
> It's about 3 times worse than G729 for encoding and just a tad bit faster on
> decoding. So, from a provider's standpoint, that means reduced capacity per
> machine, which in turn means higher overhead and less profit. Usually when
> you work out rates, you'll get your codecs worked out too. If your provider
> has to do expensive CPU work, expect to pay for it. Then again, if you're
> not running tons of traffic, it might just not make enough difference and
> they probably play the average (considering some use ULAW and some GSM,
> which could balance out your Speex usage).
> 
> Just for comparison, here's a complete "show translation" table:
> 
>          Translation times between formats (in milliseconds)
>           Source Format (Rows) Destination Format(Columns)
> 
>          g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
>    g723     -     4     2     2     3     2     1     7    11    31    18
>     gsm    12     -     2     2     3     2     1     7    11    31    18
>    ulaw    12     4     -     1     3     2     1     7    11    31    18
>    alaw    12     4     1     -     3     2     1     7    11    31    18
>    g726    13     5     3     3     -     3     2     8    12    32    19
>   adpcm    12     4     2     2     3     -     1     7    11    31    18
>    slin    11     3     1     1     2     1     -     6    10    30    17
>   lpc10    13     5     3     3     4     3     2     -    12    32    19
>    g729    13     5     3     3     4     3     2     8     -    32    19
>   speex    12     4     2     2     3     2     1     7    11     -    18
>    ilbc    14     6     4     4     5     4     3     9    13    33     -
> 
> Speex is definitely the worst performer here, as far as CPU time goes.
> (These numbers from a P4 2.4GHz, using Digium's G729 P4 codec, and Intel's
> G723, 5.3 rate, optimized for P4, and Speex 1.0.4-1, Asterisk
> CVS-HEAD-04/11/05-19:24:17).
> 
> -Michael
> 
> 
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-- 
Mike Taht
PostCards From the Bleeding Edge
http://the-edge.blogspot.com