We are experiencing a very strange problem with HTTP uploads on jboss4/tomcat. When uploading large files from IE over the network, upload speed is capped at about 70kbytes/sec even though the network allows for much higher speeds. Neither CPU nor disk access appears to be the bottleneck. When using FireFox browser, upload speed is about 4000kbytes/sec. When using IE from the server through loopback adapter, speed is 7000kbytes/sec.

This problem is happening on 2 separate servers. One is a win 2000 box with a freshly installed OS. The other one is a brand new windows server 2003 enterprise edition.

There is one machine which runs file-for-file identical jboss installation under the same version of java. When accessing that machine with IE from other boxes, uploads go fast.

I tried apache fileupload library and o'reilly MultipartRequest. I also tried reading directly from InputStream with this JSP page:

<%@ page import = "java.util.*" %>
<%@ page import = "java.io.*" %>
<%
 InputStream is = request.getInputStream();
 byte buffer[]=new byte[128*1024];
 int bytes=0;
 int total=0;
 long totalbytes=0;
 long t1=System.currentTimeMillis();
 while (0 < (bytes = is.read(buffer))) {
 total++;
 totalbytes+=bytes;
 }
 long t2=1+System.currentTimeMillis();
%>

<%if (total > 0) {%>
 time(ms): <%=t2-t1%><br>
 total buffer reads: <%=total%><br>
 total bytes: <%=totalbytes%><br>
 chunks per second: <%=total*1000/(t2-t1)%><br>
 bytes per second: <%=totalbytes*1000/(t2-t1)%><br>
 average bytes per chunk: <%=totalbytes/total%><br>
<%}%>

<form method=post ENCTYPE="multipart/form-data">
<input type=file name=a>
<input type=submit>
</form>

I cannot figure out what's different between the machine on which it works and the two on which it doesn't. Any ideas?

-- Mike