FreeRadius crashed on accounting load tests with 1000 concurrent clients

[Alan DeKok]

Dinh Pham Cong wrote:
> start_servers = 1024
> max_servers = 3000
> max_spare_servers = 3000

  That's a little high.

> My sql.conf
> 
> # number of sql connections to make to server
> num_sql_socks = 1000

  Remember: 1000 packets/s does *not* mean 1000 threads or 1000 SQL
sockets.  The server should be able to do 1000 packets/s with a much
smaller number of threads && sockets.  i.e. 50/50.

> I developed a Java client that can create 1000 concurrent threads that
> connect and send accounting requests (start and stop) to Radius server.

  See also "radperf" (http://networkradius.com/radperf.html).  It can do
load testing and user login simulations.

> However, after sending for 20 or 30 seconds, radius server generated a
> lot of error messages and crashed
> 
> Error messages
> 
> Tue Nov 10 16:14:34 2009 : Error: Discarding duplicate request from
> client tester1 port 41442 - ID: 134 due to unfinished request 2436

  This is likely because your SQL database is too slow.

  Have you checked to see if the SQL database can handle 1000 inserts/s?

> Crashed
> 
> Nov 10 15:55:35 Mobile6 kernel: radiusd[22242]: segfault at
> 00000000000000c8 rip 0000003daee5306b rsp 00002aae5d82a780 error 4

  See doc/bugs for instructions on producing useful crash reports.  We
can then use these to fix bugs.

> Nov 10 15:57:29 Mobile6 kernel: radiusd[30941]: segfault at
> 00000000000000c8 rip 0000003daee5306b rsp 00002aaee56de180 error 4
> Nov 10 16:14:36 Mobile kernel: radiusd[10788]: segfault at
> 00000000000000c8 rip 0000003daee5306b rsp 00002aac913de780 error 4
> 
> What do I need to do to enable FreeRadius server to meet more than 1000
> accounting request (INSERT AND DELETE) for a second?

  Use a database that can handle 1000 requests/s.

  Alan DeKok.