PaperMC/patches/server/0724-Consolidate-flush-calls-for-entity-tracker-packets.patch
Nassim Jahnke 928bcc8d3a
Updated Upstream (Bukkit/CraftBukkit) (#8430)
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
09943450 Update SnakeYAML version
5515734f SPIGOT-7162: Incorrect description for Entity#getVehicle javadoc
6f82b381 PR-788: Add getHand() to all relevant events

CraftBukkit Changes:
aaf484f6f SPIGOT-7163: CraftMerchantRecipe doesn't copy demand and specialPrice from BukkitMerchantRecipe
5329dd6fd PR-1107: Add getHand() to all relevant events
93061706e SPIGOT-7045: Ocelots never spawn with babies with spawn reason OCELOT_BABY
2022-10-02 09:56:36 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 4 Apr 2020 17:00:20 -0700
Subject: [PATCH] Consolidate flush calls for entity tracker packets
Most server packets seem to be sent from here, so try to avoid
expensive flush calls from them.
This change was motivated due to local testing:
- My server spawn has 130 cows in it (for testing a prev. patch)
- Try to let 200 players join spawn
Without this change, I could only get 20 players on before they
all started timing out due to the load put on the Netty I/O threads.
With this change I could get all 200 on at 0ms ping.
(one of the primary issues is that my CPU is kinda trash, and having
4 extra threads at 100% is just too much for it).
So in general this patch should reduce Netty I/O thread load.
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 89ecb5c6c25246d0c71b14cc089386d4c4b83093..6d1f929eb717f62f0d7ebb9e9b52c3788061e240 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -804,7 +804,24 @@ public class ServerChunkCache extends ChunkSource {
this.level.timings.broadcastChunkUpdates.stopTiming(); // Paper - timing
gameprofilerfiller.pop();
// Paper end - use set of chunks requiring updates, rather than iterating every single one loaded
+ // Paper start - controlled flush for entity tracker packets
+ List<net.minecraft.network.Connection> disabledFlushes = new java.util.ArrayList<>(this.level.players.size());
+ for (ServerPlayer player : this.level.players) {
+ net.minecraft.server.network.ServerGamePacketListenerImpl connection = player.connection;
+ if (connection != null) {
+ connection.connection.disableAutomaticFlush();
+ disabledFlushes.add(connection.connection);
+ }
+ }
+ try { // Paper end - controlled flush for entity tracker packets
this.chunkMap.tick();
+ // Paper start - controlled flush for entity tracker packets
+ } finally {
+ for (net.minecraft.network.Connection networkManager : disabledFlushes) {
+ networkManager.enableAutomaticFlush();
+ }
+ }
+ // Paper end - controlled flush for entity tracker packets
}
}