isapi_redirect performance issues

[ah...@cinci.rr.com]

We are using Tomcat 5.5.9 with IIS on the front end. IIS is serving all 
the static content and forwards the servlet requests to Tomcat using 
the latest version of isapi_redirect.dll and ajp13 protocol. After 
deploying the aplication over a server and accessing it through the 
internet I am noticing 8x to 10x performance slowdown when connecting 
to the application via port 80 as opposed to the direct port 8080. I 
tried using Apache WebServer in front instead of IIS and that works 
great – the performance problem is ONLY when using IIS in the front.

Unfortunately my application has to be deployed with IIS and only port 
80 open in the firewall. I have been able to reproduce this problem by 
generating a small 250 characters html page in response to the GET 
request. With Apache or connecting to Tomcat directly it takes about 
20ms for the test client to get the page. Connecting through IIS it 
takes about 173ms. Has anybody been successfully using the IIS/Tomcat 
integration over the internet? Is there anything that can be done to 
improve the performance?  IIS is also serving the static pages with 
good performance so its not a problem with standalone IIS either. Any 
idea/suggestions?

Thanks
Ahmed


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