Activity monitor networking results wrong - ( tx shows double the actual performance)

zampanothegreat wrote:

Hello,

I find that the activity monitors TX performance lies.

Running a test where the wifi ax connection speed is ~ 800mb on average, I get (using Iperf3) the following data-rates:

TX: view claims 120MB/second -- I measured 55MB/second

Can this be filed as a bug or is there a logical explanation why the TX rate is wrong?

You can file a bug report using this same link: Apple Feedback http://www.apple.com/feedback

Suggest that you also run simultaneous tests using Speedtest (free) app (or other similar app). Then if both of your third party measurements agree and show 2x difference with Activity Monitor, you will have a more convincing case for Apple to review when you send the results to them via feedback page.

By the way, on my Macs (several, with several different MacOS versions), Speedtest agrees with Activity Monitor, namely the receive and transmit speed in Mb/s is 8x what is reported in Activity Monitor in MB/s. The sampling rate is a little different but that would not explain the 2x difference you are seeing.

Also -- to maybe get to the bottom of this, you might try downloading a very large file of known size and manually time the download and compare that to the various speed tool measures you have at the same time.