disable wifi log
cd /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources
Then figure out which log settings are currently enabled by invoking:
$ sudo ./airport debug
DriverWPA
In this case only the DriverWPA setting is active. To disable that you just need to prefix it with a dash sign:
$ sudo ./airport debug -DriverWPA
Last but not least, double check and confirm that the log setting is not active anymore:
sudo ./airport debug
turn all off
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport debug -AllUserland -AllDriver -AllVendor