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From Stephen Pierzchala <>
Subject RE: [users@httpd] KeepAlives
Date Mon, 17 Mar 2003 16:42:01 GMT

My experience with Keep-Alives has been very different, but as you say, 
this is in a test environment.

A couple of things to watch for with Keep-Alives:

1) RWIN of accessing OS. Because you are keeping the connections open, 
you will actually reach the RWIN limit of your OS and throttle your own 
connection. Apply the patches to the MSFT OSes to ensure that your RWIN 
is set to 65536 + Window Scaling factor on.

2) Are you accessing the system through a proxy that does not allow 
Keep-Alives? Watch for this; remember, many of your customers are in the 
same boat.

3) Did you turn on HTTP Pipelining (Only relevant for Mozilla/Netscape 7 
and Opera)? Apache USUALLY does not have a problem with pipelining, but 
if you are going through a proxy server....????

Just some thoughts...




Stephen Pierzchala

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