Apple Catalina Appears to Introduce Massive Jitter

Thu Oct 29 15:50:29 UTC 2020

On 10/29/20 16:08, J. Hellenthal wrote:

> I believe I have seen the same thing with a Mid 2015 11,4 running catalina. Not diagnosing further because I could not find a reason for it fast enough and not sure if it really had an impact at the moment…. but could you try the following
>
>
> sudo sysctl net.link.generic.system.hwcksum_tx=0
> sudo sysctl net.link.generic.system.hwcksum_rx=0
> sudo ifconfig en0 -rxcsum

Thanks, I'll have a sniff.

> If you have some specific tests to run I would be willing to run them here on Big Sur with the same laptop but I have nothing now that runs Catalina

One of my mates found the same issue on Big Sur (beta) on a 2013 MacBook 
Pro.

Just a simple mtr test to your local home router's IP address should, 
over wi-fi, should show you the jitter.

Mark.