[asterisk-users] Asterisk Codec Translation Table

Al ar_daei at hotmail.com
Fri May 4 00:07:37 MST 2007


Hello list,
I have always though codec translation table is dircetly connected to system speed, utill i came across this:
in my lab, i have 2 boxes,
First box is an Intel Celeron 1.7 GHZ with 256M RAM:
 show translation
         Translation times between formats (in milliseconds) for one second of data
          Source Format (Rows) Destination Format (Columns)

              g723   gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722
     gsm    -           -    2    2        3               2    1     9         -     -       25    3       -
     ulaw    -         6       -    1        3               2    1     9          -     -      25    3       -
       ilbc    -        10    6    6        7                6    5    13          -     -        -    7    -
     g726    -          7    3    3        1                3    2    10         -     -        26    -    -
     

Second server is Dual Xeon 2Gh 1G RAM

show translation
         Translation times between formats (in milliseconds) for one second of data
          Source Format (Rows) Destination Format (Columns)

          g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g72 
  gsm    -      -        4    4        6           4        3    28      -        -      25    5    -
 ulaw    -      7        -     1        4           2        1    26     -           -   23    3    -
  ilbc    -      9        4    4        6           4        3    28      -         -      -     5    -
  g726    -    7         2    2        1           2        1    26      -         -     23     -    -


Here is the fun part, box1 is faster in converting ulaw to gsm!
Is this table accurate?
Does it mean asterisk is not handeling multiple cpus very good?
both boxes running asterisk 1.4.4



     
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