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From Jason Joines <supp...@bus.okstate.edu>
Subject [users@httpd] Re: mod_proxy performance tips needed
Date Thu, 07 Jul 2005 19:01:22 GMT
Jason Joines wrote:
>    I'm attempting to use mod_proxy under Apache 2.0.52 with the prefork 
> MPM on SuSE Linux 8.1 to reverse proxy connections to the File Manager 
> module of a Usermin 1.140 server running on SuSE Linux 9.2.  The Apache 
> server and the Usermin server are both using SSL.
> 
>    The Apache server is a PIII 1 GHz with 1 GB of RAM.  Both servers and 
> various test clients are all plugged into the same ethernet switch.  I'm 
> using various copies of a 128 MB file on the Usermin server to check 
> speeds.  If I download the file to either the client or the Apache 
> server from the Usermin server directly, the average speed always 
> exceeds 6 MB/s.  However, downloading to the client via the proxy on the 
> Apache server with these settings in my SSL VirtualHost section drops 
> the speed to 0.023 MB/s:
> 
> SSLProxyEngine on
> ProxyRequests Off
>  <Proxy *>
>    Order deny,allow
>    Allow from all
>  </Proxy>
> ProxyPass /ourfiles https://userminserver:20000
> ProxyPassReverse /ourfiles https://userminserver:20000
> 
>      I tried adding "ProxyReceiveBufferSize 2048" and the speed 
> increased to 0.048 MB/s.  ProxyRecieveBufferSize values of 4096, 8192 
> and 16384 yielded respective speeds of 0.049 MB/s, 0.053 MB/s and 0.24 
> MB/s.
> 
>    In each case, the download starts just as fast as the direct 
> connections.  The first 10 MB or so are almost instantaneous.  However, 
> the speed steadily declines.  In each case other than 
> "ProxyReceiveBufferSize 16384", I killed the download off at about 70 MB 
> as it had ground nearly to a halt.
> 
>    I guess I can keep keep bumping the ProxyReceiveBufferSize up but I'm 
> concerned  about what other impacts this might have on the Apache server 
> as performing this proxy is not it's only task in life.  Any suggestions 
> would be much appreciated.
> 
> 
> Thanks,
> 
> Jason Joines
> =================================


	I reran all the tests and this time the results were different.  16384 
was one of the slowest settings.  It seemed changing 
ProxyReceiveBufferSize wasn't really having any affect.

	I tried disabling SSL on the target box and that fixed the problem. 
Proxy speeds are no near direct connect speeds.

Jason
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