I was curious, so poked at this... my results from a macbook pro 2019 running Catalina 10.15.3
sudo /usr/local/sbin/mtr -r 10.200.200.200 Start: 2020-10-29T14:09:08-0400 HOST: bos-mp36c Loss% Snt Last Avg Best Wrst StDev 1.|-- 10.200.200.200 0.0% 10 11.9 63.7 9.0 340.2 104.1 sudo sysctl net.link.generic.system.hwcksum_tx=0 net.link.generic.system.hwcksum_tx: 1 -> 0 sudo sysctl net.link.generic.system.hwcksum_rx=0 net.link.generic.system.hwcksum_rx: 1 -> 0 sudo ifconfig en0 -rxcsum sudo /usr/local/sbin/mtr -r 10.200.200.200 Start: 2020-10-29T14:09:43-0400 HOST: bos-mp36c Loss% Snt Last Avg Best Wrst StDev 1.|-- 10.200.200.200 0.0% 10 19.8 13.6 9.8 20.9 4.5 So, seems to make things better. =-) On Thu, Oct 29, 2020 at 11:50 AM Mark Tinka <mark.ti...@seacom.com> wrote: > > > 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. >