Tomcat 5.5.17 has max 40 KB / sec

[Steffen Heil]

Hi

I use tomcat 5.5.17 and want to upload files. As this was *very* slow in
some cases, I wrote a benchmark servlet. Code is below.
I get the following statistics:

1. Running server on debian linux it accepts about 8.5 MB / sec. (Could
slowed down by VM overhead.)
2. Running server on windows xp it accepts about 3.5 MB / sec when the
client is connected over an rinetd redirection.
3. Running server on windows xp it accepts ONLY 40 KB / sec when the clinet
is connected directly.

This problem applies to Internet Explorer 6.0 as client only.
It does not occur so with Firebird (but still only about 2.4 MB / sec).

Using wireshark I found that the Internet Explorer is sending only 8 KB
(exactly) followed by an tcp PSH, which is not answered by the windows xp
machine running tomcat for 0.2 sec. That gives me exactly the 40 KB/sec.

I would say, my xp tcp stack is damaged, but it works with the same server,
when redirected through an external rinetd.

What can I do ?
Where can I start debugging ?
Anyone having similar problems ?

If possible, please also reply to me directly (CC).

Regards,
   Steffen



-->8-----------------------------------------------------------------------

package mypackage;

import java.io.InputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


public class UpstreamBenchmark extends HttpServlet implements Runnable
{

        private long start = -1;

        private int total;

        private Thread thread;

        private final byte[] buffer = new byte[ 4096 ];


        public void run()
        {
                while ( !Thread.interrupted() ) {
                        if ( start != -1 ) {
                                long time = System.currentTimeMillis() -
start + 1;
                                double speed = ( total / 1.024 ) / time;
                                System.out.println( "speed: " + speed + "
kb/sec" );
                        }
                        try {
                                Thread.sleep( 500 );
                        } catch ( Throwable t ) {
                                t.printStackTrace();
                        }
                }
        }


        @Override
        public void destroy()
        {
                thread.interrupt();
                super.destroy();
        }


        @Override
        public void init()
                throws ServletException
        {
                super.init();
                thread = new Thread( this );
                thread.start();
        }


        @Override
        protected final void doPost( HttpServletRequest request,
HttpServletResponse response )
        {
                try {
                        total = 0;
                        start = System.currentTimeMillis();
                        InputStream is = request.getInputStream();
                        int read;
                        while ( ( read = is.read( buffer ) ) != -1 )
                                total += read;
                        is.close();
                        System.out.println( "read " + total + " bytes." );
                } catch ( Throwable t ) {
                        t.printStackTrace();
                }
                start = -1;
        }

}

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