[Asterisk-Dev] results: Intel's IPP G.729 with Asterisk

[Steve Underwood]

Hi,

About 18 months ago I took the IPP based codec, and experimented with 
it. It performs in the same ballpark as Digium's original G.729 codec, 
when run of a P4 based Xeon machine. I think Digium's newer codec runs 
about the same speed as the old one. The IPP stuff really sucks. They 
use the parallelism of the SIMD instructions, but combine it with so 
much overhead the final performance is unimpressive. If you take the 
floating point version of the reference codec from the ITU web site it 
isn't that much slower. None  of these codecs seems to have been 
sensibly optimised.

Regards,
Steve


Daniel Pocock wrote:

> I've ported Intel's IPP-based codec to Asterisk and the results are 
> printed below.  Does anyone know how this compares to Digium's codec - 
> could someone post similar stats?
>
> The code is currently pre-alpha - the Intel demo didn't look after 
> releasing memory, etc, because it was just a demo to be run in 
> `one-shot' mode.  If the feedback I get suggests that these benchmarks 
> are good, then I will clean up my implementation so that it is safe 
> for continuous, 24x7 operation, and if messy patent and copyright laws 
> permit, release it publicly.  If anyone believes this is worth 
> pursuing further, please feel free to contact me on or off the list.
>
> This was executed on a P4 2.8GHz with 512MB RAM.  Lot's of Mozilla and 
> virtual machine based applications running at the same time too.  The 
> phone I'm using with it is a Budgetone 102 with latest firmware, audio 
> sounds fine in both directions.
>
> h1*CLI> show translation
>        Translation times between formats (in milliseconds)
>         Source Format (Rows) Destination Format(Columns)
>
>        G723   GSM  ULAW  ALAW  G726 ADPCM SLINR LPC10 G729A SPEEX  ILBC
>  G723     -     -     -     -     -     -     -     -     -     -     -
>   GSM     -     -     2     2     -     2     1     8    12     -    24
>  ULAW     -     6     -     1     -     2     1     8    12     -    24
>  ALAW     -     6     1     -     -     2     1     8    12     -    24
>  G726     -     -     -     -     -     -     -     -     -     -     -
> ADPCM     -     6     2     2     -     -     1     8    12     -    24
> SLINR     -     5     1     1     -     1     -     7    11     -    23
> LPC10     -     7     3     3     -     3     2     -    13     -    25
> G729A     -     7     3     3     -     3     2     9     -     -    25
> SPEEX     -     -     -     -     -     -     -     -     -     -     -
>  ILBC     -     9     5     5     -     5     4    11    15     -     -
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