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-------- Original Message --------
Subject: [SPAM] Re: Apple Catalina Appears to Introduce Massive Jitter
From: colin johnston <colinj@gt86car.org.uk>
Date: Thu, October 29, 2020 11:12 am
To: Mark Tinka <mark.tinka@seacom.com>
Cc: NANOG <nanog@nanog.org>
Hey Mark,Good shout with debug, same issue seen on MacBook Air with Catalina 10.15.6 beta, pings upto 150ms seeniMac with Sierra zero jitter and usually sub 1m pingsNow need to find out why, I never noticed as wife using the MacBook Air :(I cant yet update to big sur since need lots of sad space, need to cutdown on university docs me thinks
ColOn 29 Oct 2020, at 12:07, Mark Tinka <mark.tinka@seacom.com> wrote:
Hi all.
I've been on High Sierra for several years now due to a limitation with an app that couldn't deal with Apple's latest rounds of system permissions since Mojave. Eventually, I gave up on waiting for them to fix it and upgraded my older Butterfly keyboard laptop to Catalina 4 weeks ago.
At the same time, I picked up the new Magic keyboard laptop 2 weeks ago which came with Catalina.
Over the past week, I've been troubleshooting a massive jitter issue on Catalina, just between itself and my home router. For control, I have a Windows PC (tower-top) using a wireless adapter to connect to my home network. That has no jitter at all.
I have noticed as much as 300ms+ jitter on Catalina.
I then asked a few friends around the world to run tests for me on their own Catalina installations to their local router over wi-fi, and the results are the same. Jitter so high that what should be a 1ms - 5ms latency can (for a short period) jump to 200ms+, 300ms+, 400ms+.
On the off-chance that it is an issue with the new wireless chips on the later MacBook models, one of my friends tested the same on a 2013 MacBook Pro running a beta version of Big Sur. Same story!
Another friend in South East Asia, testing on a 2018 13-inch MacBook Pro running Catalina, also had the same issue.
A Google search suggests that this is some known issue since Mojave, to do with Location Services, and some other apps, in a non-deterministic way:
https://apple.stackexchange.com/questions/263638/macbook-pro-experiencing-ping-spikes-to-local-router"]https://apple.stackexchange.com/questions/263638/macbook-pro-experiencing-ping-spikes-to-local-router
For me, even after disabling all or some Location Services features, the problem remains.
Is anyone else seeing this on their Catalina Mac's while on wi-fi? If so, does anyone know what's going on here?
Ideally, this wouldn't matter if it was just a cosmetic issue - but I do actually see physical impact to performance of network access to/from the laptop, which has all the hallmarks of high jitter and/or packet loss.
An app like Zoom, which can display network performance data for a session in real-time, does indicate nominal packet loss for audio and video on this device, while other devices on the same WLAN are happy.
Thoughts?
Mark.