Re: Apple Catalina Appears to Introduce Massive Jitter - SOLVED!

[Aaron Atac via NANOG <nanog () nanog org>]

Hi Mark,

I'm running a MacBook Pro (Retina, 15-inch, Mid 2015) with Mojave 10.14.6 (latest).
I've always had location services off (including all system services within).

I haven't seen any jitter issues on my end.

Along with, no matter if I have bluetooth turned on with my wireless mouse and keyboard connected or not, I see no 
consistent change in jitter.

Even further, enabling location services (including all system services within) and bluetooth enabled, I'm not seeing 
any change in jitter.

I know you said earlier this issue seems to have started somewhere _around_ Mojave so just my two cents.

-Aaron

Oct 30, 2020, 12:08 by mark.tinka () seacom com:

> Hi all.
>  
>  So I may have fixed this for my end, and hopefully others may be      able to use the same fix.
>  
>  After a tip from Karl Auerbach and this link:
>  
>      > https://developer.apple.com/forums/thread/97805
>  
>  ... I was able to fix the problem by disabling Bluetooth. 
>  
>  However, disabling Bluetooth was not enough. I also had to disable      all Location Services.
>  
>  After that, I re-enabled Location Services and only allowed for      two features:
>  
>      - NetSpot
>      - Find My Mac
>  
>  With just those two location services, as well as Bluetooth      disabled, I have no more high jitter.
>  
>  App performance like Zoom and Youtube uploads are now crisp, with      0.0% packet loss.
>  
>  So looks like that Bluetooth is a huge problem. Confirmed by      opening the "Console" app, and adding "scan" in 
> the filter bar,      top right.
>  
>  A peak latency of 13.5ms after 300 packets:
>  
>  Marks-MacBook-Pro.local(172.16.0.239)                                                                                
>                                                                                                             
> 2020-10-30T21:06:05+0200
>  Keys:  Help   Display mode   Restart statistics   Order of      fields   quit
>                                                                                                                       
>                                                                                              Packets               
> Pings
>   Host                                                                                                                
>                                                                                            Loss%   Snt   Last   Avg  
> Best  Wrst StDev
>   1.172.16.0.254                                                                                                      
>                                                                                            0.0%   300    3.1   4.8   
> 2.2  13.5   1.9
>  
>  Mark.
>  
>