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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.
23 lines
1.2 KiB
Diff
23 lines
1.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Sun, 5 Jul 2020 22:38:18 -0400
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Subject: [PATCH] Optimize NetworkManager Exception Handling
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diff --git a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
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index 421dd76816063d56ea80339b77531729edd6aa55..1523d69b7b332f0085f40310a94d406da6513edc 100644
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--- a/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
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+++ b/src/main/java/net/minecraft/network/Varint21FrameDecoder.java
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@@ -39,6 +39,12 @@ public class Varint21FrameDecoder extends ByteToMessageDecoder {
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}
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protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) {
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+ // Paper start - Perf: Optimize exception handling; if channel is not active just discard the packet
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+ if (!channelHandlerContext.channel().isActive()) {
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+ byteBuf.skipBytes(byteBuf.readableBytes());
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+ return;
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+ }
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+ // Paper end - Perf: Optimize exception handling
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byteBuf.markReaderIndex();
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this.helperBuf.clear();
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if (!copyVarint(byteBuf, this.helperBuf)) {
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