Пропиши в /etc/rc.local

ulimit -n 32000

и в консоли это напиши
чтоб не перезагружаться. А прописка в rc.local нужна для автоматики работы

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Current stats:
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Uptime: 0 days, 0 hours, 39 minutes
Version: PtokaX DC Hub 0.4.1.1 built on Feb 2 2009 17:26:44
OS: Linux 2.6.18-12-fza-686-bigmem (i686)
Users (Max/Actual Peak (Max Peak)/Logged): 10000 / 873 (941) / 811
Users shared size: 89744368104428 Bytes / 81.62 TB
Chat messages: 19 x
Unknown commands: 0 x
PM commands: 34 x
Key commands: 1881 x
Supports commands: 1893 x
MyINFO commands: 11679 x
ValidateNick commands: 1885 x
GetINFO commands: 0 x
Password commands: 534 x
Version commands: 1507 x
GetNickList commands: 1512 x
Search commands: 9518 x (0 x)
SR commands: 8691 x
CTM commands: 80509 x (0 x)
RevCTM commands: 24294 x
BotINFO commands: 1 x
Close commands: 0 x
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CPU usage (60 sec avg): 0.29%
CPU time: 0:37:27
Mem usage (Peak): 67520 kB (67524 kB)
VM size (Peak): 95264 kB (95264 kB)
Stack size / Libs size: 84 kB / 2900 kB
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SendRests (Peak): 271 (826)
RecvRests (Peak): 0 (5)
Compression saved: 206.15 MB (802)
Data sent: 357.98 MB
Data received: 7.43 MB
Tx (60 sec avg): 304.96 kB/s (15.33 kB/s)
Rx (60 sec avg): 2.52 kB/s (4.33 kB/s)