[asterisk-users] What does pct mean?

[Andres]

On 2/13/18 1:32 PM, Eric Wieling wrote:
> Could this gap in sequence numbers caused by a codec change generate 
> errors like the one below?
>
Yes, that is something I have seen before as well.  The CPE changes 
codec and forgets what sequence number it was on (or something like 
that).  The two ends might not notice any audio issues however. Having 
said that, I have seen other PBXs that choke on something like this and 
most often drop the call completely when this happens.
> [2018-02-13 12:57:43] WARNING[4917][C-0004c2cb] codec_sangoma.c: 
> [526559][g722toulaw] Got Seq 15944 but expecting 10106 (time since 
> last read = 0ms), dropped 5838 packets
>
> On 02/13/2018 01:24 PM, Andres wrote:
>> 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
>>>>
>>>> Security and Communication by Commend
>>>>
>>>> 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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>>>>
>>>>
>>>
>>
>>
>
>


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