FULL PRODUCT VERSION :
java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux localhost 3.11.10-100.fc18.x86_64 #1 SMP Mon Dec 2 20:28:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
When the fixedContentLength is set with HttpURLConnection.setFixedLengthStreamingMode(), 
sun.net.www.protocol.http.HttpURLConnection.getOutputStream() is about 6 times slower than the jdk7u25 with fixedLengthStreamingMode is enabled. I checked several jdk7 version , this is introduced since jdk7u40. 

REGRESSION.  Last worked in version 7u25

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1  connection.setFixedLengthStreamingMode(length);
2. connection.getOutputstream()
3. compare the getOutputStream with jdk7u60 , jdk7u40 and jdk7u25


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
jdk7u60 can get same performance with jdk7u25 to getOutputStream with fixedLengthStreamingMode enabled. 
ACTUAL -
jdk7u60 is much slower than jdk7u25 to getOutputStream from HttpURLConnection.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
         HttpURLConnection connection = (HttpURLConnection)url.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoInput(true);
        connection.setDoOutput(true);
     
        connection.setFixedLengthStreamingMode(requestBody.length());
        
        connection.setRequestProperty("Content-Type", "text/xml; charset=UTF-8");
        connection.setRequestProperty("Accept", "*/*");

        connection.connect();
        long start = System.currentTimeMillis();
        OutputStream outputStream = connection.getOutputStream();
        long end = System.currentTimeMillis();
---------- END SOURCE ----------