On 11/17/2010 10:23 PM, Ahmed Bakir wrote:
Thanks for the responses!
@jeroen:
- There is no bandwidth difference between the connections. Both the
client and the host are either running on the same machine or on the
same LAN (I have tested on both and see the problem in both cases)
- I have increased TCP receiver buffers, and that has alleviated the
problem but it's not a feasible solution for my application.
Because ?
- I am running httpd on Windows (I have tried both Windows 7 and
Windows XP)
Ugh.
Fugly TCP stack.
- These are my MPM details:
Timeout 300
MaxKeepAliveRequests 100
KeepAliveTimeout 15
For a reverse proxy with heavy load, DISABLE keepalives. COMPLETELY.
They don't serve any useful purpose, and may in fact slow things down.
You won't observe the issues when testing from one client, because that
one client will re-use its connections.
However, this does not work in the real world - proxy connections are
fire-and-forget as far as the server is concerned.
Keepalive under heavy load contributes to what you are seeing - service
unavailable.
<IfModule mpm_winnt.c>
ThreadsPerChild 250
MaxRequestsPerChild 0
</IfModule>
- I have configured my reverse proxy using rewrite rules with the [P]
directive
This is an example:
RewriteRule ^files/(.*)$ http://localhost:16/$1 [P]
Yeah... that means you can't regulate the proxy pool size and other
settings.
I'd reconsider using rewriterules when you don't really know why you're
using them.
A proper FilesMatch or Proxy block will do just fine:
<Proxy /files/*>
ProxyPass http://localhost:16/ min=100 max=250 smax=100 acquire=1000ms
</Proxy>
For example; I am by no means an expert on proxy configuration, but
this I could infer from the documentation in a few minutes.
You need to match the number of backend threads to your expected or -
better - observed connections.
- I did not set any ProxyPass options in my config.
Perhaps you should!
--
J.
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