From b7806469aa14552fea0aece2446419b9a96c27cc Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 11 Mar 2018 14:13:33 -0400
Subject: [PATCH] Disable Implicit Network Manager Flushing

This seems completely pointless, as packet dispatch uses .writeAndFlush.

Things seem to work fine without implicit flushing, but incase issues arise,
provide a System property to re-enable it using improved logic of doing the
flushing on the netty event loop, so it won't do the flush on the main thread.

Renable flushing by passing -Dpaper.implicit-flush=true

diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index b93a26e8f..da7c45697 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -78,6 +78,7 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
     // Paper start - NetworkClient implementation
     public int protocolVersion;
     public java.net.InetSocketAddress virtualHost;
+    private static boolean enableImplicitFlush = Boolean.getBoolean("paper.implicit-flush");
     // Paper end
 
     public NetworkManager(EnumProtocolDirection enumprotocoldirection) {
@@ -255,7 +256,7 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
         }
 
         if (this.channel != null) {
-            this.channel.flush();
+            if (enableImplicitFlush) this.channel.eventLoop().execute(() -> this.channel.flush()); // Paper - we don't need to implicit flush here, but allow opt in incase issues are found to a better version
         }
 
     }
-- 
2.16.2