[Freeswitch-users] rtp-timer-name / timer issues

[Geoff Mina]

Stock CentOS w/ Kernel 3.10.0-693.el7.x86_64.  Freeswitch 1.6.19~64bit

We have TLS Websocket /DTLS-SRTP connections on one side and standard UDP
SIP on the other.  Both sides using G.711, so no transcoding.




On Mon, Feb 5, 2018 at 7:07 PM, Colin Morelli <colin.morelli at gmail.com>
wrote:

> Ubuntu 16.04 LTS. Do you have any custom kernel settings or just a stock
> CentOS instance?
>
> On Mon, Feb 5, 2018 at 8:23 PM Geoff Mina <gmina at connectfirst.com> wrote:
>
>> What OS are you using? We run FS at over 600 concurrent calls on a
>> smaller EC2 (c4.xlarge) size and have not had any issues in either US-East
>> or US-West.
>>
>> Running FS Installed from YUM. CentOS7.
>>
>> > On Feb 5, 2018, at 5:56 PM, Colin Morelli <colin.morelli at gmail.com>
>> wrote:
>> >
>> > Hey list,
>> >
>> > I'm running FS on EC2 (I know, I know). Having some issues with random
>> packet loss, which I believe almost certainly I have narrowed down to timer
>> issues and/or network latency/jitter (seems surprising since I'm using
>> c5.xlarge instances).
>> >
>> > Behavior is that, during a call, brief pauses or notable audio loss
>> will occur. This is on high bandwidth links that are otherwise stable.
>> Freeswitch logs with max debug spew out "Hot Hit 1" through "Hot Hit 10"
>> and eventually "auto-flush catching up 1 packet(s)" in rapid succession
>> (usually going through the cycle 4-5 times) before things settle again.
>> Obviously that means a minimum of 4-5 audio packets were dropped within the
>> span of a second which results in considerable audio artifacting.
>> >
>> > Changing rtp-timer-name to none, which I understand to perform
>> synchronous reads of RTP audio (as opposed to timer-based async reads)
>> makes the audio notably smoother. That said, I'm having a hard time
>> uncovering the consequences of doing this. Obviously I understand that
>> reads will block the RTP thread, but I can't seem to understand the
>> potential ramifications of this. Could anyone help clarify?
>> >
>> > My other question is: assuming "timer while hot" indicates what I
>> believe it does (that when the timer hit there was >1 packet in the queue
>> to be read), couldn't this issue also just be caused by network jitter, and
>> not necessarily just timer inconsistencies?
>> >
>> > Thanks in advance.
>> >
>> > Best,
>> > Colin
>> >
>> >
>> > ____________________________________________________________
>> _____________
>> > Professional FreeSWITCH Consulting Services:
>> > consulting at freeswitch.org
>> > http://www.freeswitchsolutions.com
>> >
>> > Official FreeSWITCH Sites
>> > http://www.freeswitch.org
>> > http://confluence.freeswitch.org
>> > http://www.cluecon.com
>> >
>> > FreeSWITCH-users mailing list
>> > FreeSWITCH-users at lists.freeswitch.org
>> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/
>> options/freeswitch-users
>> > http://www.freeswitch.org
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
>> FreeSWITCH-users mailing list
>> FreeSWITCH-users at lists.freeswitch.org
>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> http://www.freeswitch.org
>
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
> Official FreeSWITCH Sites
> http://www.freeswitch.org
> http://confluence.freeswitch.org
> http://www.cluecon.com
>
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20180205/00efcb6b/attachment-0001.html>