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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
40 lines
2.1 KiB
Diff
40 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Shane Freeder <theboyetronic@gmail.com>
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Date: Wed, 19 Aug 2020 05:05:54 +0100
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Subject: [PATCH] Buffer joins to world
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This patch buffers the number of logins which will attempt to join
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the world per tick, this attempts to reduce the impact that join floods
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has on the server
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diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
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index 38947f40864f3661df2eb4baa0aef5740b82f9d9..134810ac91d828d67759cd1ed56f11b71e292917 100644
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--- a/src/main/java/net/minecraft/network/Connection.java
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+++ b/src/main/java/net/minecraft/network/Connection.java
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@@ -445,12 +445,26 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
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}
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}
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+ private static final int MAX_PER_TICK = io.papermc.paper.configuration.GlobalConfiguration.get().misc.maxJoinsPerTick; // Paper - Buffer joins to world
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+ private static int joinAttemptsThisTick; // Paper - Buffer joins to world
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+ private static int currTick; // Paper - Buffer joins to world
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public void tick() {
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this.flushQueue();
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+ // Paper start - Buffer joins to world
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+ if (Connection.currTick != net.minecraft.server.MinecraftServer.currentTick) {
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+ Connection.currTick = net.minecraft.server.MinecraftServer.currentTick;
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+ Connection.joinAttemptsThisTick = 0;
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+ }
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+ // Paper end - Buffer joins to world
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PacketListener packetlistener = this.packetListener;
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if (packetlistener instanceof TickablePacketListener tickablepacketlistener) {
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+ // Paper start - Buffer joins to world
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+ if (!(this.packetListener instanceof net.minecraft.server.network.ServerLoginPacketListenerImpl loginPacketListener)
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+ || loginPacketListener.state != net.minecraft.server.network.ServerLoginPacketListenerImpl.State.VERIFYING
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+ || Connection.joinAttemptsThisTick++ < MAX_PER_TICK) {
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tickablepacketlistener.tick();
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+ } // Paper end - Buffer joins to world
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}
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if (!this.isConnected() && !this.disconnectionHandled) {
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