[asterisk-users] What does pct mean?

[Andres]

On 2/13/18 11:55 AM, Michael Maier wrote:
> On 02/13/2018 at 08:41 AM Floimair Florian wrote:
>> No you're reading it wrong.
>>
>> There are 188K received with no loss, and 16441K transmitted.
> This doesn't make any sense to me, either. There can't be more packages
> transmitted than received. It's the same codec in and out and it's been
> running exactly the same time.
Lost and Percent (pct) are not calculated by counting packets. Those are 
calculated from the sequence numbers in the RTP frame.

For example let's say you start the receiver (Asterisk) at Sequence 
#1....then something happens and it jumps to sequence #5000.  The audio 
might be fine, but now the stats say 4998 packets were lost. Why is 
there a bizarre sequence jump?  Hard to say.  I have seen it because of 
bugs that eventually get fixed on the CPE, or even when there is a 
change of codec (or re-invite) mid-call.  I would not worry too much 
about this unless you can reproduce it and can address it properly at 
the CPE level.  A packet capture will clearly confirm what I am 
referring to here.  Just look at every Sequence # in the RTP flow and 
you will see the jump.
>
>> ...........Receive......... .........Transmit..........
>> Count    Lost Pct  Jitter   Count    Lost Pct    Jitter  RTT....
>> 188K      0    0   0.000    188K   16641K 8809   0.000   0.026
>    ^^^^                        ^^^^
> There are 188K received and 188K transmitted. Pct is unknown - what's Pct?
>
>
>> Still 8809 does not sound like a percentage to me 😉 so there is something wrong with either the label or the value.
>>  From what's in the code, you can see it's clearly a lost Packet count not a percentage.
>> So I guess Pct in this case is short for "Packet".
>>
>>   
>>   
>> With best regards
>>
>> Florian Floimair
>> Innovation - Software-Development
>>
>> COMMEND INTERNATIONAL GMBH
>> http://www.commend.com
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>>
>> FN 178618z | LG Salzburg
>>
>> -----Ursprüngliche Nachricht-----
>> Von: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] Im Auftrag von Michael Maier
>> Gesendet: Montag, 12. Februar 2018 17:46
>> An: asterisk-users at lists.digium.com
>> Betreff: Re: [asterisk-users] What does pct mean?
>>
>> Hi Carsten,
>>
>> On 02/11/2018 at 07:46 PM Carsten Bock wrote:
>>> Hi,
>>>
>>> Lost percent (%)....
>> Are you sure? I'm seeing here:
>>
>> ...........Receive......... .........Transmit..........
>> Count    Lost Pct  Jitter   Count    Lost Pct    Jitter  RTT....
>> 188K      0    0   0.000    188K   16641K 8809   0.000   0.026
>>
>> => This doesn't sound reliable to me: there are 188K packets and 16641K of them are lost?! The Pct value is fluctuating between about 6009 and 9009.
>>
>> Thanks,
>> Michael
>>
>>
>>>
>>> Am 11.02.2018 19:27 schrieb "Michael Maier" <m1278468 at mailbox.org>:
>>>
>>>> Hello,
>>>>
>>>> could somebody please tell me the meaning of "Pct" as seen in asterisk cli:
>>>>
>>>> ...........Receive......... .........Transmit..........
>>>> Count    Lost Pct  Jitter   Count    Lost Pct  Jitter RTT....
>>>>
>>>>
>>>> Thanks,
>>>> Michael
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