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From Pete Helgren <>
Subject [users@httpd] Performance tuning Apache 2.2 64bit on Windows
Date Tue, 29 Jan 2013 00:22:25 GMT
We have implemented Apache 2.4 64bit on Windows Server 2008 R2 as a reverse proxy to take advantage
of a wildcard cert for our domain. We have been disappointed in the performance with even
a light load (like 8-10 users) so I have probably misconfigured something. The web sites served
by the proxy (Glassfish 3.0.1) become increasingly slow to the point of being unresponsive.
Restarting Apache temporarily fixes the problem but it quickly becomes unresponsive. Bypassing
the proxy by going to the IP address of the Glassfish server directly we get very fast response
times so it seems that GF isn't the issue. The only thing we are doing is the reverse proxy
of the SSL frontend on Apache and passing traffic on the internal network with http to the
Glassfish server.

When the websites are unresponsive, a look at the Windows Server processes indicates VERY
little activity. CPU might be running at 10% (single CPU). There are less than 30 TCP connections.
Memory utilization is less than a GB (it is a 4GB machine). Network traffic barely breaks
the 100kbps threshold. All indications are that the server is barely breaking a sweat, yet
the site is unresponsive.

I have set the following properties:
SSLSessionCache  "shmcb:C:/Apache_direct/logs/ssl_scache(1024000)"
SSLSessionCacheTimeout  300
ThreadsPerChild 3000
MaxRequestsPerChild 0
KeepAlive On
KeepAliveTimeout 15
ProxyRequests Off
SSLStrictSNIVHostCheck off
ProxyBadHeader Ignore

I have virtual host settings for each http and https port for each server. VHost settings
follow this pattern:

<VirtualHost *:443>
ProxyPreserveHost On
SSLEngine on
ProxyPass /
ProxyPassReverse /


Have I missed an important setting here or misconfigured a setting? Based on what I have read,
Apache should be able to easily handle the traffic we have which is as follows:

800 visits an hour.  13k visits daily.
100 uploads an hour of roughly 60mb MP3 files.
400 downloads an hour of those same MP3 files.
800 downloads of small (100k) pdf files.
Glassfish is serving all the file uploads/downloads and we allow those sessions to persist
up to an hour. Since most of the files are unique, we are a little uncertain of what cache
settings we should use (if any). Perhaps I should omit the SSL cache settings?

There are many, many hits on Apache performance tuning on the web but few that deal specifically
with reverse proxy, SSL and give recommendations based on type/amount of traffic. Some suggestions
would be very helpful.

Pete Helgren
Developer/Team Lead
Bible Study Fellowship

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