[asterisk-users] Core show translation > 4000ms

[Kevin P. Fleming]

On 09/30/2011 07:49 AM, Administrator TOOTAI wrote:
> Le 30/09/2011 14:05, Kevin P. Fleming a écrit :
>> On 09/30/2011 03:56 AM, Administrator TOOTAI wrote:
>>> Hi list,
>>>
>>> we have 2 asterisk boxes in VM (kvm) on 2 different Dell servers, one is
>>> Lenny kernel 2.6.26 asterisk 1.6.2.20, the second CentOS 2.6.18 asterisk
>>> 1.4.36 (Elastix). Both 64bits, no hardware involved, dahdi on both
>>> machines for meetme timing.
>>>
>>> Doing core show translation give on the Lenny server
>>>
>>> Translation times between formats (in microseconds) for one second of
>>> data
>>> Source Format (Rows) Destination Format (Columns)
>>>
>>> g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722
>>> siren7 siren14 slin16
>>> g723 - - - - - - - - - - - - - - - -
>>> gsm - - 2 2 4001 2 1 2 - - - 4001 4002 - - 4003
>>> ulaw - 4001 - 1 4001 2 1 2 - - - 4001 4002 - - 4003
>>> alaw - 4001 1 - 4001 2 1 2 - - - 4001 4002 - - 4003
>>> [...]
>>>
>>> and on the CentOS one
>>>
>>> g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722
>>> g723 - - - - - - - - - - - - -
>>> gsm - - 2 2 2 2 1 3 - 6 - 2 2
>>> ulaw - 2 - 1 2 2 1 3 - 6 - 2 2
>>> alaw - 2 1 - 2 2 1 3 - 6 - 2 2
>>> [...]
>>>
>>> Why do we have such latency on the Lenny machine for the codec
>>> translation? Is this due to a kernel parameter?
>>
>> Because you didn't read the output. It clearly says "(in
>> microseconds)" in the 1.6.x output.
>>
>
> Well, I surely ask the wrong way, sorry: ms or us, 4001 from ulaw to gsm
> and 2 the other way, still a huge difference. The output from centos
> shows similar value in both directions.

This is why the output was changed to microseconds from milliseconds; in 
the older version, the lowest number that should be shown was 1 
millisecond, even if the actual amount of time consumed was 10 
microseconds (or less). The "1" numbers in the output from the older 
could easily have been "0.02", which would be closer to the output from 
the new version.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org