Hopefully I'm not steerin' ya wrong, but I'd say it's a safe bet the
fact that it's a virtual machine is a factor, somehow.
Jim
Bruce N wrote:
Thanks for the input again Jim.
Yes, it is a virtual machine. Ec2 from Amazon.I have noticed that the transcode
value remains high for ever until the system is restarted. It doesn't
depreciate (suppose we have greater CPU power in future for the virtual
machine).
Yes, I do have problems with g729 with the transcode rises to 10000ms as calls
don't make it at all.
Thanks for the hint on the special flagh. I will try to find that.
Regards,Bruce
----------------------------------------
Date: Sun, 30 Aug 2009 23:37:44 -0400
From: [email protected]
To: [email protected]
CC: [email protected]
Subject: Re: [on-asterisk] Details of "core show translation" output
When you say "amazon instance" do you mean it's a virtual machine in the
amazon computing cloud? In that environment, the CPU is probably not
100% dedicated to you. The algorithm that determines the transcoding
times for 'show translations' may not be related to the actual
transcoder (in other words, it may just estimate). I'd personally be
suspicious of any results from 'show translations' on a virtual machine.
This is an uneducated guess, but I would suspect that there'd have to be
some special flags you'd want to pass to the asterisk compiler to let it
know about the virtual machine (I recall reading something about that
somewhere, but can't for the life of me remember where or when). The
linux compiler might need to know something about that as well.
Anyhow, to save time digging around, I would suggest answering the
following two questions:
1) do you need any of those codecs?
2) do you have any audio quality problems?
If the answer to both is 'no', then I for one would not worry about it
too much.
Jim
Bruce N wrote:
Thanks for the description Jim.
Why does the g729 codec show 2ms when Asterisk is restarted while other times
it can show something as high as 4000ms?
This is all under no load at all when this happens or simply a call or two.
Once Asterisk restarted, all works fine.
The following is the cpu info (this is an amazon instance):
[r...@ip-10-251-69-209 ~]# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 65
model name : Dual-Core AMD Opteron(tm) Processor 2218 HE
stepping : 3
cpu MHz : 2600.000
cache size : 1024 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu tsc msr pae mce cx8 apic mca cmov pat pse36 clflush mmx fxsr sse
sse2 ht syscall nx mmxext fxsr_opt lm 3dnowext 3dnow up pni cx16 lahf_lm
cmp_legacy svm cr8legacy ts fid vid ttp tm stc
bogomips : 5202.13
Thanks,
Bruce
----------------------------------------
Date: Sun, 30 Aug 2009 22:33:29 -0400
From: [email protected]
To: [email protected]
CC: [email protected]
Subject: Re: [on-asterisk] Details of "core show translation" output
IIRC, that describes the time in milliseconds estimated to transcode
between the codecs.
Do you use any of those codecs? If not, you might want to noload them in
modules.conf
What sort of CPU is that running on? Is it a normal flavour of linux?
Bruce N wrote:
Hi Guys,
What exatly do the numbers underneath the codecs mean when one does a "core show
translation"?
I have a system which from time to time shows different numbers under g729 and
the codec stops responding. Once I restart asterisk everything goes back to
normal.
Follwoing is output of "core show translation" pre and after asterisk restart.
Before Restart
*******************************
*CLI> core show translation
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 slin16
g723 - - - - - - - - - - - - - -
gsm - - 2 2 2 2 1 2 4001 6000 9999 2 2 2
ulaw - 2 - 1 2 2 1 2 4001 6000 9999 2 2 2
alaw - 2 1 - 2 2 1 2 4001 6000 9999 2 2 2
g726aal2 - 2 2 2 - 2 1 2 4001 6000 9999 1 2 2
adpcm - 2 2 2 2 - 1 2 4001 6000 9999 2 2 2
slin - 1 1 1 1 1 - 1 4000 5999 9998 1 1 1
lpc10 - 2 2 2 2 2 1 - 4001 6000 9999 2 2 2
g729 - 2 2 2 2 2 1 2 - 6000 9999 2 2 2
speex - 2 2 2 2 2 1 2 4001 - 9999 2 2 2
ilbc - 2 2 2 2 2 1 2 4001 6000 - 2 2 2
g726 - 2 2 2 1 2 1 2 4001 6000 9999 - 2 2
g722 - 2 2 2 2 2 1 2 4001 6000 9999 2 - 1
slin16 - 3 3 3 3 3 2 3 4002 6001 10000 3 1 -
After Asterisk Restart
**********************************************
*CLI> core show translation
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 slin16
g723 - - - - - - - - - - - - - -
gsm - - 2 2 2 2 1 1001 2 13999 2 2 2 2
ulaw - 2 - 1 2 2 1 1001 2 13999 2 2 2 2
alaw - 2 1 - 2 2 1 1001 2 13999 2 2 2 2
g726aal2 - 2 2 2 - 2 1 1001 2 13999 2 1 2 2
adpcm - 2 2 2 2 - 1 1001 2 13999 2 2 2 2
slin - 1 1 1 1 1 - 1000 1 13998 1 1 1 1
lpc10 - 10000 10000 10000 10000 10000 9999 - 10000 23997 10000 10000 10000 10000
g729 - 2 2 2 2 2 1 1001 - 13999 2 2 2 2
speex - 2 2 2 2 2 1 1001 2 - 2 2 2 2
ilbc - 2 2 2 2 2 1 1001 2 13999 - 2 2 2
g726 - 2 2 2 1 2 1 1001 2 13999 2 - 2 2
g722 - 2 2 2 2 2 1 1001 2 13999 2 2 - 1
slin16 - 3 3 3 3 3 2 1002 3 14000 3 3 1 -
Any input is appreciated.
Thanks,
Bruce
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