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-------- Original Message --------<br>
Subject: [SPAM] Re: Apple Catalina Appears to Introduce Massive Jitter<br>
From: colin johnston <<a href="mailto:colinj@gt86car.org.uk">colinj@gt86car.org.uk</a>><br>
Date: Thu, October 29, 2020 11:12 am<br>
To: Mark Tinka <<a href="mailto:mark.tinka@seacom.com">mark.tinka@seacom.com</a>><br>
Cc: NANOG <<a href="mailto:nanog@nanog.org">nanog@nanog.org</a>><br>
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Hey Mark,<div class="">Good shout with debug, same issue seen on MacBook Air with Catalina 10.15.6 beta, pings upto 150ms seen</div><div class="">iMac with Sierra zero jitter and usually sub 1m pings</div><div class="">Now need to find out why, I never noticed as wife using the MacBook Air :(</div><div class="">I cant yet update to big sur since need lots of sad space, need to cutdown on university docs me thinks</div><div class=""><br class=""></div><div class="">Col</div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On 29 Oct 2020, at 12:07, Mark Tinka <<a target="_blank" href="mailto:mark.tinka@seacom.com" class="">mark.tinka@seacom.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""> <div class=""> <font face="Tahoma" class="">Hi all.<br class=""> <br class=""> 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.<br class=""> <br class=""> At the same time, I picked up the new Magic keyboard laptop 2 weeks ago which came with Catalina.<br class=""> <br class=""> 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.<br class=""> <br class=""> I have noticed as much as 300ms+ jitter on Catalina.<br class=""> <br class=""> 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+.<br class=""> <br class=""> 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!<br class=""> <br class=""> Another friend in South East Asia, testing on a 2018 13-inch MacBook Pro running Catalina, also had the same issue.<br class=""> <br class=""> 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:<br class=""> <br class=""> <a target="_blank" class="moz-txt-link-freetext" href="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</a><br class=""> <br class=""> For me, even after disabling all or some Location Services features, the problem remains.<br class=""> <br class=""> Is anyone else seeing this on their Catalina Mac's while on wi-fi? If so, does anyone know what's going on here?<br class=""> <br class=""> 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. <br class=""> <br class=""> 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.<br class=""> <br class=""> Thoughts?<br class=""> <br class=""> Mark.<br class=""> </font> </div> </div></blockquote></div><br class=""></div>
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