From 1dce1009e67ea4b5934a61b1bcf8a217bd12cc76 Mon Sep 17 00:00:00 2001
From: Ahmed Mahdy <44652453+ahmeb99@users.noreply.github.com>
Date: Mon, 8 Apr 2019 16:58:15 -0700
Subject: [PATCH] Disable Nagle algorithm in Windows

---
 src/core/lib/iomgr/tcp_windows.cc | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/core/lib/iomgr/tcp_windows.cc b/src/core/lib/iomgr/tcp_windows.cc
index 7b464651ea1..3c17d7e2057 100644
--- a/src/core/lib/iomgr/tcp_windows.cc
+++ b/src/core/lib/iomgr/tcp_windows.cc
@@ -88,6 +88,19 @@ static grpc_error* enable_loopback_fast_path(SOCKET sock) {
              : GRPC_WSA_ERROR(status, "WSAIoctl(SIO_LOOPBACK_FAST_PATH)");
 }
 
+static grpc_error* enable_socket_low_latency(SOCKET sock) {
+  int status;
+  BOOL param = TRUE;
+  status = ::setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, 
+                        reinterpret_cast<char*>(&param), sizeof(param));
+  if (status == SOCKET_ERROR) {
+    status = WSAGetLastError();
+  }
+  return status == 0
+             ? GRPC_ERROR_NONE
+             : GRPC_WSA_ERROR(status, "setsockopt(TCP_NODELAY)");
+}
+
 grpc_error* grpc_tcp_prepare_socket(SOCKET sock) {
   grpc_error* err;
   err = grpc_tcp_set_non_block(sock);
@@ -96,6 +109,8 @@ grpc_error* grpc_tcp_prepare_socket(SOCKET sock) {
   if (err != GRPC_ERROR_NONE) return err;
   err = enable_loopback_fast_path(sock);
   if (err != GRPC_ERROR_NONE) return err;
+  err = enable_socket_low_latency(sock);
+  if (err != GRPC_ERROR_NONE) return err;
   return GRPC_ERROR_NONE;
 }