<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body bgcolor="#ffffff" text="#000000">
<font size="-1"><font face="Verdana">Hello all,<br>
<br>
I'm having trouble with dropped connections under a loadtest. <br>
<br>
The setup: Java app with Tomcat 6 under an Ubuntu 8.04 VPS
(virtual linux server) proxied with a varnish 2.1.2 (16M malloc)<br>
<br>
The test: The load test itself is aimed at generating many HTTP
connections, which after a brief setup phase are served entirely
by varnish. Hence the system load remains low (2% CPU consumed
by varnish at 300 requests / second).<br>
<br>
The problem: As a measure for response, I am requesting an image
from the webapp running in Tomcat while the loadtest is
underway. However that either times out or is delivered after
several seconds. Varnishlog will often either not show the
request (RxURL) at all, or show it several seconds after the
browser dispatched it.<br>
<br>
I don't believe it to be a network/OS issue, as the server will
happily accept SSH connections while the loadtest is ongoing and
remains responsive throughout the test.<br>
<br>
How do I debug this?<br>
<br>
Thanks in advance,<br>
G.<br>
<br>
</font></font>
</body>
</html>