Re: [users@httpd] mod_proxy performance with apache 2.2

[Skye Poier Nott]

Hi Joshua,

I've tried changing MaxClients from 256 to 512 to 1024, no effect.





Thanks,
Skye


On 19-Mar-08, at 12:28 PM, Joshua Slive wrote:

I've tried changing from MPM prefork to worker, and twiddled threads per child, no effect. Just can't seem to get more than about 4 Mbit/sec out of the origin. I'll give dev@ a ping.

On Tue, Mar 18, 2008 at 8:51 PM, Skye Poier Nott <[EMAIL PROTECTED]> wrote:

Hi,

I am doing some load testing on a reverse proxy with apache 2.2 +
mod_proxy and I'm getting terrible throughput, I was wondering if
anyone had a suggestion.

I have the following config, all on gigabit ethernet:

1 origin server -> 2 mod_proxy servers -> 4 client simulators (flood)

The origin and proxy servers are configured with 100 name-based
virtual hosts, the proxy servers with config like this:

<VirtualHost *:80>
        ServerName w0099.example.com
        ProxyPass / http://10.100.10.XX:80/w0099/
        ProxyPassReverse / http://10.100.10.XX:80/w0099/
</VirtualHost>


When I start up flood on the client simulators (250 clients each), I
only get about 4 Mbit/sec out of the origin server.  I've tried
twiddling all the settings in mod_proxy to no avail (like smax=64
max=512 ttl=120 min=8 acquire=1)

If I set up lighttpd on the proxy servers, I fully saturate the gigE
on the origin server (~500 Mbit/sec)


sort of resource or lock or something contention in mod_proxy that I
should know about?

What could explain this 125x difference in performance? Is there some

I'm not a mod_proxy performance expert (and you might need to ask on
the [EMAIL PROTECTED] list to find one), but you should start with the basics:
have you looked at the mod_status server-status output? Are you
exceeding MaxClients? Is there anything interesting in the error log?

Joshua.

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