reduce sleep rate if file io thread sleep is enabled

so we will still give it time to sleep to avoid the issue, but reduce the
known negative effects of that sleeping.

Spigot-Server-Patches/0083-Chunk-save-queue-improvements.patch

@@ -1,4 +1,4 @@
-From 2d2446c8e66b71c2101f78d0d42701c03952fcf9 Mon Sep 17 00:00:00 2001
+From 009f6b77c95094a9d2e9698ab89a0ae8eaa539b4 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Fri, 4 Mar 2016 18:18:37 -0600
 Subject: [PATCH] Chunk save queue improvements
@@ -16,9 +16,14 @@ This has multiple impacts:
    elevated memory usage, and then the objects used in the serialization sit around longer than needed,
    resulting in promotion to Old Generation instead of dying young.
 
-If there is work to do, then the thread should be doing its work, and only sleep when it is done.
+To optimize this, we change the entire unload queue to be a proper queue. This improves the behavior of popping
+the first queued chunk off, instead of abusing iterators like Mojang was doing.
 
-Additionally, optimize the ChunkRegionLoader queue to reduce lock contention (issue with 1.9)
+This also improves reliability of chunk saving, as the previous hack job had a race condition that could
+fail to save some chunks.
+
+Then finally, Sleeping will by default be removed, but due to known issues with 1.9, a config option was added.
+But if sleeps are to remain enabled, we at least lower the sleep interval so it doesn't have as much negative impact.
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
 index 62f4631..ed49d83 100644
@@ -141,7 +146,7 @@ index 5bd6ce0..336e780 100644
 +    // Paper end
  }
 diff --git a/src/main/java/net/minecraft/server/FileIOThread.java b/src/main/java/net/minecraft/server/FileIOThread.java
-index 198b00f..d997dd4 100644
+index 4733f94..113aea2 100644
 --- a/src/main/java/net/minecraft/server/FileIOThread.java
 +++ b/src/main/java/net/minecraft/server/FileIOThread.java
 @@ -39,11 +39,15 @@ public class FileIOThread implements Runnable {
@@ -155,7 +160,7 @@ index 198b00f..d997dd4 100644
 +            // Paper start - Add toggle
 +            if (com.destroystokyo.paper.PaperConfig.enableFileIOThreadSleep) {
 +                try {
-+                    Thread.sleep(this.e ? 0L : 10L);
++                    Thread.sleep(this.e ? 0L : 2L);
 +                } catch (InterruptedException interruptedexception) {
 +                    interruptedexception.printStackTrace();
 +                }
@@ -165,5 +170,5 @@ index 198b00f..d997dd4 100644
  
          if (this.b.isEmpty()) {
 -- 
-2.7.2
+2.7.3