From d887779eb6e69fa6f04aefb46c20cb508d3ee2a6 Mon Sep 17 00:00:00 2001
From: Jakub Valtar <jakub.valtar@gmail.com>
Date: Mon, 22 Jan 2018 20:28:09 +0100
Subject: [PATCH] Net-client: perf tuning - make read buf the size of socket
 receive buf

---
 java/libraries/net/src/processing/net/Client.java | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/java/libraries/net/src/processing/net/Client.java b/java/libraries/net/src/processing/net/Client.java
index fffa2391b..61bdfa9be 100644
--- a/java/libraries/net/src/processing/net/Client.java
+++ b/java/libraries/net/src/processing/net/Client.java
@@ -219,7 +219,15 @@ public class Client implements Runnable {
 
   @Override
   public void run() {
-    byte[] readBuffer = new byte[2048]; // Ethernet MTU = 1500 B
+    byte[] readBuffer;
+    { // make the read buffer same size as socket receive buffer so that
+      // we don't waste cycles calling listeners when there is more data waiting
+      int readBufferSize = 2 << 16; // 64 KB (default socket receive buffer size)
+      try {
+        readBufferSize = socket.getReceiveBufferSize();
+      } catch (SocketException ignore) { }
+      readBuffer = new byte[readBufferSize];
+    }
     while (Thread.currentThread() == thread) {
       try {
         while (input != null) {