Looking at the Diagnostic and Urgent Messages of the Console I see the following message repeated every 10 seconds. Why? Is something wrong? Should this be happening? How can I stop it if not?
com.apple.message.domain: com.apple.wifi.internal.scanning
MacBook Pro, OS X El Capitan (10.11.6), Hi-Res anti-glare wide screen
I'm not 100% certain, but if you click on the Wi-Fi menu bar icon and leave the drop down showing, you should notice it scans for new networks at a regular interval. The message may be related to that. In general, unless you are experiencing problems, the Console messages are for the most part useless.
This issue has been driving me crazy for some time. Every 10 seconds or so, performance on my machine would suffer dramatically. It was not a CPU issue, and I couldn't see anything related to a process eating a bunch of I/O. Finally, I used ping to just watch what was going on between my MacBook Pro and the wireless gateway. Every 10 seconds, 1-3 ping packets would be lost, and then the next several packets would be delayed by 300-900ms. And every few minutes, I would have packet loss for 30 seconds or more.
In Console, I kept getting the "com.apple.message.domain: com.apple.wifi.internal.scanning No Error" message, and it coincides with the ping packet loss.
Next thing I tried was to HUP the WiFiAgent.
ps auxww | grep -i wifiagent
found the corresponding process...
kill -HUP {pid}
And now it is working just fine... back to ~2.5ms response times and no packet loss at all. And, all of the "No Error" messages in the Console stopped occurring.
Something clearly set it on this bad path, and I would like to figure out what that is. But for now, it appears to be better.
The machine impacted is a MacBook Pro (15-inch, 2016) running Sierra 10.12.4.
Hope that this helps you as well.
repeated com.apple.wifi.internal.scanning log messages
