[asterisk-users] How accurate is show translation?

[Leo Ann Boon]

Hi all,

I'm using 'show translation' to help dimension my system, but I confused 
by the results I get. My 2 test systems (results below): an AthlonXP 
2000+ (1.3GHz) and a Pentium D930 (duo-core, 3.0GHz) produced similar 
results (D930 is slightly faster). Googling shows that others have 
similar results running on other CPU speeds >2.0GHz.

At first glance, it would look like the AthlonXP gives better bang for 
the buck :). But, I'm sure that are other reasons. I know show 
translation times how long it takes a convert 1s of full duplex audio. I 
suspect the test is using a single CPU (since it's in a single thread) 
and there are some constant overheads that makes a 3.0GHz produce the 
same numbers as a 1.3GHz.

I would love to hear how others are using the results from show 
translation in system dimensioning. So far, I feel that dimensioning an 
Asterisk box is still mostly guesstimation :). Currently, I'm using the 
30MHz per call rule to dimension.

Leo

Results from show translation:
On the athlon:
         g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
   g723     -     3     2     2     2     2     1     3    10    11    13
    gsm     -     -     2     2     2     2     1     3    10    11    13
   ulaw     -     3     -     1     2     2     1     3    10    11    13
   alaw     -     3     1     -     2     2     1     3    10    11    13
   g726     -     3     2     2     -     2     1     3    10    11    13
  adpcm     -     3     2     2     2     -     1     3    10    11    13
   slin     -     2     1     1     1     1     -     2     9    10    12
  lpc10     -     4     3     3     3     3     2     -    11    12    14
   g729     -     4     3     3     3     3     2     4     -    12    14
  speex     -     4     3     3     3     3     2     4    11     -    14
   ilbc     -     4     3     3     3     3     2     4    11    12     -


On the D930:
         g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
   g723     -     -     -     -     -     -     -     -     -     -     -
    gsm     -     -     2     2     2     2     1     5     9    10    14
   ulaw     -     2     -     1     2     2     1     5     9    10    14
   alaw     -     2     1     -     2     2     1     5     9    10    14
   g726     -     2     2     2     -     2     1     5     9    10    14
  adpcm     -     2     2     2     2     -     1     5     9    10    14
   slin     -     1     1     1     1     1     -     4     8     9    13
  lpc10     -     3     3     3     3     3     2     -    10    11    15
   g729     -     3     3     3     3     3     2     6     -    11    15
  speex     -     3     3     3     3     3     2     6    10     -    15
   ilbc     -     3     3     3     3     3     2     6    10    11     -




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