IOS 9 is no longer afraid of WiFi offline Apple to solve network problems
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In order to solve the problem of network instability and frequent downtime on Mac OS X 10.10, Apple made a helpless decision to delete the new Discoveryd network task thread and re-enable the old mDNSresponder.
At that time, we thought it was just a temporary measure, and Discoveryd would come back when the problem was solved, but Apple seemed desperate about it and had to finish it.
After studying iOS 9 with Xcode Instruments development tools, you can find that mDNSresponder is back.
MDNSresponder is still used in OS X 10.11 El Capitan.
It is not known whether the returned mDNSresponder has changed, or whether it is still the same as at that time. If it is the latter, Apple is really ashamed.
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