--- /dev/null	2017-10-12 07:30:16.967999979 +0530
+++ new/src/jdk.net/linux/native/libextnet/LinuxSocketOptions.c	2017-10-12 14:12:52.921689727 +0530
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+#include <sys/socket.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <jni.h>
+#include <netinet/tcp.h>
+#include "jni_util.h"
+
+/*
+ * Class:     jdk_net_LinuxSocketOptions
+ * Method:    setQuickAck
+ * Signature: (II)V
+ */
+JNIEXPORT void JNICALL Java_jdk_net_LinuxSocketOptions_setQuickAck0
+(JNIEnv *env, jobject unused, jint fd, jboolean on) {
+    int optval;
+    int rv;
+    optval = (on ? 1 : 0);
+    rv = setsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &optval, sizeof (optval));
+    if (rv < 0) {
+        if (errno == ENOPROTOOPT) {
+            JNU_ThrowByName(env, "java/lang/UnsupportedOperationException",
+                            "unsupported socket option");
+        } else {
+            JNU_ThrowByNameWithLastError(env, "java/net/SocketException",
+                                        "set option TCP_QUICKACK failed");
+        }
+    }
+}
+
+/*
+ * Class:     jdk_net_LinuxSocketOptions
+ * Method:    getQuickAck
+ * Signature: (I)Z;
+ */
+JNIEXPORT jboolean JNICALL Java_jdk_net_LinuxSocketOptions_getQuickAck0
+(JNIEnv *env, jobject unused, jint fd) {
+    int on;
+    socklen_t sz = sizeof (on);
+    int rv = getsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &on, &sz);
+    if (rv < 0) {
+        if (errno == ENOPROTOOPT) {
+            JNU_ThrowByName(env, "java/lang/UnsupportedOperationException",
+                            "unsupported socket option");
+        } else {
+            JNU_ThrowByNameWithLastError(env, "java/net/SocketException",
+                                        "get option TCP_QUICKACK failed");
+        }
+    }
+    return on != 0;
+}
+
+/*
+ * Class:     jdk_net_LinuxSocketOptions
+ * Method:    quickAckSupported
+ * Signature: ()Z
+ */
+JNIEXPORT jboolean JNICALL Java_jdk_net_LinuxSocketOptions_quickAckSupported0
+(JNIEnv *env, jobject unused) {
+    int one = 1;
+    int rv, s;
+    s = socket(PF_INET, SOCK_STREAM, 0);
+    if (s < 0) {
+        return JNI_FALSE;
+    }
+    rv = setsockopt(s, SOL_SOCKET, TCP_QUICKACK, (void *) &one, sizeof (one));
+    if (rv != 0 && errno == ENOPROTOOPT) {
+        rv = JNI_FALSE;
+    } else {
+        rv = JNI_TRUE;
+    }
+    close(s);
+    return rv;
+}