[Freeswitch-users] Jitter and dropping MOS score

John Hardiman john.hardiman at missionlabs.co.uk
Wed Oct 6 08:36:01 UTC 2021

Hi Christoph,

For the CPU part: On linux boxes if a process in top goes over 100% or top shows >1.0 in load, this means that more than one core is occupied. Since you have 16 cores this is fine as you are using 1/16 of your CPU for the FreeSWITCH process. So 200% would be 2 cores fully used etc, etc.

For the Jitter part/dropping MoS, we might need a bit more info, like times or patterns that is happens or even what the MoS drops by and how much jitter is seen. I personally use SNGrep and a combination of Homer/VoIPMonitor to get all of the stuff I need. 

Accurate monitoring will point you in the right direction if there is an issue (Homer 7 is free and really good as a side note)



-----Original Message-----
From: Christoph Russow <russow at emtex.de> 
Sent: 05 October 2021 10:34
To: freeswitch-users at lists.freeswitch.org
Subject: [Freeswitch-users] Jitter and dropping MOS score

Hi all,

we are currently experiencing jitter and dropping MOS score on an increasing amount of calls on our system.

i can't see any increased load on our system (neither CPU nor I/O wise).

Current stats:

~ 15Mbit/s network traffic (on a 1Gbit/s network) load average: 1,10, 0,82, 0,91 (16 core machine) memory used: 2,26GB/16GB

freeswitch at lc1> status
UP 0 years, 12 days, 13 hours, 30 minutes, 24 seconds, 649 milliseconds,
831 microseconds
FreeSWITCH (Version 1.10.1 -release-12-f9990221e6 64bit) is ready
137634 session(s) since startup
218 session(s) - peak 245, last 5min 222
1 session(s) per Sec out of max 30, peak 8, last 5min 2
1000 session(s) max
min idle cpu 0.00/95.37
Current Stack Size/Max 244K/244K

System ist not virtualized.

the only "strange" thing i see is the freeswitch "main"process that consumes (according to htop) >=100% cpu (see attached screenshot).
Can this be the problem? if yes what can i do against it.

if not what are possible bottlenecks i should weed out?

if you need any additional informations to help me sort out this problem please don't hesitate to ask.

Thanks in advance and best regards


Christoph Russow
Software Engineer

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