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.tinka@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.