Freeradius performance problem

[Giuseppe Marocchio]

Hello Guys

i have inherited the administration of a radius server, that
authenticate  900 PPPoE user on mikrotik box.

i've noticed that there is some performance problem, mikrotik box show
that  "last request RTT" in some cases is up to 1000ms, there is some
"resend" request and  also some "timeouts", In order to mitigate the
problem i've  disabled  the   interim update, and the timeouts are
drastically reduced.
But exists.


i' use mysql back-end, i've checked if there are slow queries but file
is empty. ( of course is enabled... )

the server is a dual core Xeon 3.0Ghz with 1 Gb of ram. 
The SO is debian Linux stable,  freeradius is   2.1.10 installed by
debian package.


Configuration of Thread/server:
max_request_time = 30
cleanup_delay = 2
max_requests = 10240

thread pool {

        start_servers = 20
        max_servers = 32

        min_spare_servers = 3
        max_spare_servers = 10

        max_requests_per_server = 0
}

Any ideas?

 
Best Regards,
-- 
Giuseppe Marocchio
Tel: (+39) 045.5116192
Fax: (+39) 045.5111197
skype: giuseppe.marocchio