[Mono-list] Why is MONO network streaming much slower than .NET?

[Hund]

Hi, 
is MONO network streaming slow?
 
First I built a very simple client/server program 
to get a data stream over network.
In both programs I used a TcpClient,
a NetworkStream and a byte array (8kB chunks)
to stream 20 MB of data.
 
Then I tested the transfer rate of the client/server
program between different Linux/MONO (1.2.3.1) 
and different Windows/.NET (2.0) hosts
in a 100 Mbit/s ethernet.
 
The strange result: If MONO was involved 
the speed was dramatically reduced.
Only a .NET/.NET transfer showed a realistic
rate.  
 
.NET --> MONO : 31...42 Mbit/s   LOW
MONO --> MONO : 43...45 Mbit/s   LOW
MONO --> .NET : 51...76 Mbit/s   LOW
.NET --> .NET : 94 Mbit/s        O.K.
 
What's wrong here?
Any suggestions or hints?
Thanks in advance.
 
Cheers
Andreas

=======================================================
 

Sourcecodes:
 
// ******
// Client
// ******
 
using System;
using System.IO;
using System.Net.Sockets;
 
namespace SimpleStreamClient
{
  class SimpleStreamClient
  {
    public static void Main(string[] args) {
      TcpClient client;
      NetworkStream netStream;
      byte[] buf = new byte[8192];
      int bytesToReceive = buf.Length;
      int receivedBytes = 0;
      int bytesReceived = 0;
 
      for(int index = 0; index < 10; index++) {
        client = new TcpClient(args[0], 14866);
        netStream = client.GetStream();
        DateTime startTime = DateTime.Now;
        bytesReceived = 0;
        
        while(true) {
          bytesToReceive = buf.Length;
          
          while(bytesToReceive > 0) {
            receivedBytes = netStream.Read(buf, 0, bytesToReceive);
            if(receivedBytes == 0) {
              break;
            }
            bytesReceived += receivedBytes;
            bytesToReceive -= receivedBytes;
          }
          if(receivedBytes == 0) {
            break;
          }
        }
        double rate = bytesReceived / (((TimeSpan)(DateTime.Now -
startTime)).TotalMilliseconds * 1000) * 8;
        Console.WriteLine(bytesReceived + " Bytes received (" + rate +
"MBit/s).");
      }
    Console.ReadKey();
    }
  }
}
 

// ******
// Server
// ******
 
using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
 
namespace SimpleStreamServer
{
  class SimpleStreamServer
  {
    public static void Main(string[] args) {
      TcpClient client;
      NetworkStream netStream;
      byte[] bigBuf = new byte[20000000];
      MemoryStream ms = new MemoryStream(bigBuf);
      byte[] buf = new byte[8192];
      string host = Dns.GetHostEntry(args[0]).AddressList[0].ToString();
      IPAddress ipAddr = IPAddress.Parse(host);
      TcpListener listener = new TcpListener(ipAddr, 14866);
      listener.Start();
      
      while(true) {
        Console.WriteLine("Waiting for client ...");
        client = listener.AcceptTcpClient();        
        Console.WriteLine("New client!");        
        netStream = client.GetStream();
        ms.Seek(0, SeekOrigin.Begin);
        int readBytes = 0;
        while((readBytes = ms.Read(buf, 0, buf.Length)) != 0) {
          netStream.Write(buf, 0, readBytes);
        }
        netStream.Flush();
        client.Close();
      }
    }
  }
}

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