Bandwidth Abuse #3828

Too much bandwidth overhead

• We're sending Ping/Pong bidirectionally at 10Hz
  • Hard-coded DefaultPingInterval set to 0.1f
• We're also sending TimeSnapshot bidirectionally at 60Hz
  • Governed by Network Manager Send Rate

Pull the TestPingPong branch

• This branch has additional logging added to:
  • NetworkManager
  • NetworkTime
  • NetworkConnectionToClient
  • NetworkClient
  • NetworkServer
• This branch also has Mirage Profiler added to package manifest.

Setting Up

• In the Mirror/Tests folder, find TestPingPong folder
• Open the scene and add to build settings
• Switch to Dedicated Server platform, Build and Run (IL2CPP)
• Switch to Desktop platform
• Open Profiler window and enable Deep Profiling
  • Also add Mirror Received and Mirror Sent modules to profiler
• Editor Console: enable Collapse
• Play in editor and connect the client (there is intentionally no Player object)
• Observe the timestamped log flood in editor and server consoles
• Observe the bandwidth used in the profiler (400B/s in, 500B/s out)

Remedies

• Only NT / Prediction needs Snapshot messages, so only enable when they're activated at runtime
  • Does this really need to be 60Hz? Couldn't this be capped at something sufficient, like 30Hz or less?
• Nothing needs Ping/Pong at 10Hz - Default should be reset back to 0.5Hz or lower as a base keep-alive.