Proxy - Stop Responding

[Keiko Higa <khiga123@hotmail.com>]

Good Afternoon,
 
I have a Freeradius (1.1.5) running on a server (1G RAM, double processor) as a Proxy Radius, on a production enviroment to AAA VOIP calls.
 
At peak hours, the Radius stop responding.  I cannot see any message on the log, just stop working.
I have to kill/load manually in order to work again. Then, it appeared a message:
     "Error: Error receiving packet: Interrupted system call"
 
I disabled all the logs (detail, pre_proxy_log, post_proxy_log), authorize/authenticate (chap, pap, etc), tunning some parameters like max_requests, thread pool, cleanup_delay, etc.
 
Not running exec, hostname_lookups = no, etc.. Nothing special.
 
The only thing I configured is: preproxy_users (in order to change de NAS-IP-Address), suffix (to identify the realm).
 
At peak hours, one of the radius (behind the proxy) takes up to 14 seconds to answer. When it happens, there's a message in  the logs like "Dropping conflicting packet from....". But not always, I mean, sometimes Radius stops working but there's no delay.
 
So, what's going on?...Can somebody help me?
 
Just in case, these are the values for most of the parameters:
    max_request_time = 20 
    delete_blocked_requests = no
    cleanup_delay = 2 
    max_requests = 2560 
    thread pool {
            start_servers = 10
            max_servers = 50 
            min_spare_servers = 10
            max_spare_servers = 10 
            max_requests_per_server = 250
        }
    instantiate {
        }
    authorize {
        preprocess
        suffix
        }
    authenticate {
        }
    preacct {
        preprocess
        acct_unique
        suffix
        }
    accounting {
        }
    session {
        }
    post-auth {
        }
    pre-proxy {
        files
        }
    post-proxy {
        }

Thanks in advance,
 
Keiko.

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