ippool and cache-size

[Konstantin Chekushin]

 Hi all. I have a question about rlm_ippool and cache-size option.
  Info from description: cache-size: The gdbm cache size for the db
 files. Should be equal to the number of ip's available in the ip
 pool.
  Also, note the cache size matches the number of IP's in your pool.
 More is OK but wasteful, less is very bad.
  My pool size is 32k. And I'm using this pool only for fallback
 issue. So, I'll need it rarely in the future.
  If cache-size = 32768, then radiusd process takes all memory.
  "Mon Sep 13 12:33:46 2010 : Error: Couldn't fork: Cannot allocate
 memory"
  If cache-size = 16384 :
  top:
  PID USER      PR  NI  VIRT 
 RES  SHR S %CPU %MEM    TIME+ 
 COMMAND                                                             
  
   3061 freerad   20   0  304m 261m 1080
 S    0 52.1   0:00.00 radiusd
  radiusd takes 261m! :-[ ]
  So, here is my question. If I'll use default cache-size =800, and at
 some point radius will start using this pool, what will happen if all
 800 ip-addresses will be taken? Will the system slowdown, or if there
 will be a segmentation fault or something else? Why is "less is very
 bad"?
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