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Remove wall-time / unused skip tick protection (#11412)

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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.
This commit is contained in:
Bjarne Koll 2024-09-19 16:36:07 +02:00 • committed by GitHub
parent 5c82955733
commit c5a10665b8
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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31
patches/server/0784-Add-missing-SpigotConfig-logCommands-check.patch Normal file
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@ -0,0 +1,31 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NonSwag <mrminecraft00@gmail.com>
Date: Thu, 8 Dec 2022 20:25:05 +0100
Subject: [PATCH] Add missing SpigotConfig logCommands check
Co-authored-by: david <mrminecraft00@gmail.com>
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 6b869ff834af1e02f55683b3399d40bee0518bf1..a2a7d499a68841ecd76ba029298094993a82bf39 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -2057,7 +2057,9 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
private void performUnsignedChatCommand(String command) {
// CraftBukkit start
String command1 = "/" + command;
+ if (org.spigotmc.SpigotConfig.logCommands) { // Paper - Add missing SpigotConfig logCommands check
ServerGamePacketListenerImpl.LOGGER.info(this.player.getScoreboardName() + " issued server command: " + command1);
+ }
PlayerCommandPreprocessEvent event = new PlayerCommandPreprocessEvent(this.getCraftPlayer(), command1, new LazyPlayerSet(this.server));
this.cserver.getPluginManager().callEvent(event);
@@ -2097,7 +2099,9 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
private void performSignedChatCommand(ServerboundChatCommandSignedPacket packet, LastSeenMessages lastSeenMessages) {
// CraftBukkit start
String command = "/" + packet.command();
+ if (org.spigotmc.SpigotConfig.logCommands) { // Paper - Add missing SpigotConfig logCommands check
ServerGamePacketListenerImpl.LOGGER.info(this.player.getScoreboardName() + " issued server command: " + command);
+ } // Paper - Add missing SpigotConfig logCommands check
PlayerCommandPreprocessEvent event = new PlayerCommandPreprocessEvent(this.getCraftPlayer(), command, new LazyPlayerSet(this.server));
this.cserver.getPluginManager().callEvent(event);