nanog mailing list archives
Re: Apple Catalina Appears to Introduce Massive Jitter
From: Mark Tinka <mark.tinka () seacom com>
Date: Thu, 29 Oct 2020 14:28:49 +0200
Ah yes, an example of what I am seeing: Marks-MacBook-Pro.local (172.16.0.239) 2020-10-29T14:28:27+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 0.8% 126 3.9 34.7 2.5 232.1 54.9 Mark. On 10/29/20 14:07, Mark Tinka 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-routerFor 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.
Current thread:
- Re: Apple Catalina Appears to Introduce Massive Jitter, (continued)
- Re: Apple Catalina Appears to Introduce Massive Jitter colin johnston (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Mark Tinka (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Mark Tinka (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Aaron C. de Bruyn via NANOG (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Peter Beckman (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Mel Beckman (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Aaron C. de Bruyn via NANOG (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Brielle (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Aaron C. de Bruyn via NANOG (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Aaron C. de Bruyn via NANOG (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Blake Hudson (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Mark Tinka (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Mark Tinka (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Randy Bush (Oct 29)
- Re: Apple Catalina Appears to Introduce Massive Jitter Mark Tinka (Oct 29)