Server crashes

[Amr el-Saeed]

Dear All,

I have a big problem with my freeRadius server

the log file each less than a minute logs that the server can't allocate 
memory

Error: FATAL: Thread create failed: Cannot allocate memory

I have this configuration

start_servers = 20
max_servers = 400
min_spare_servers = 30
max_spare_servers = 60
max_requests_per_server = 0


i have 4G memory , this is the Top result

Mem:  4090068k av,  420312k used, 3669756k free,       0k shrd,   15408k 
buff


i got about 3G free memory  , how comes that the radius can't allocate 
memory  !!