High CPU usage - Is this normal?

[Heartless]

Is it normal for a 24 slot css server to use 90%~ / 1 core of a cpu?

Code:

Operating system: Ubuntu linux 64-bit
Processor: 2.8GHz Dual Core
RAM: 2GB

Code:

] meta list
  [01] SourceMod (1.3.4) by AlliedModders LLC
  [02] CS:S Tools (1.3.4) by AlliedModders LLC
  [03] BinTools (1.3.4) by AlliedModders LLC
  [04] SDK Tools (1.3.4) by AlliedModders LLC
  [05] CS:S DM (2.1.1) by AlliedModders

Code:

] sm plugins list
"Sound Commands" (1.3.4) by AlliedModders LLC
"Quake Sounds" (2.7) by dalto, Grrrrrrrrrrrrrrrrrrr, and psychonic
"Fun Votes" (1.3.4) by AlliedModders LLC
"Admin File Reader" (1.3.4) by AlliedModders LLC
"Fun Commands" (1.3.4) by AlliedModders LLC
"CS:S DM Equipment" (2.1.0.446) by AlliedModders LLC
"CS:S DM Basics" (2.1.0.446) by AlliedModders LLC
"CS:S DM Spawn Protection" (2.1.0.446) by AlliedModders LLC
"CS:S DM Preset Spawns" (2.1.0.446) by AlliedModders LLC
"CS:S DM Bot Quotas" (2.1.0.446) by AlliedModders LLC
"Radio Spam Block" (1.0.0) by exvel
"Reserved Slots" (1.3.4) by AlliedModders LLC
"Basic Votes" (1.3.4) by AlliedModders LLC
"Basic Comm Control" (1.3.4) by AlliedModders LLC
"No Block" (1.0.0.0) by sslice
"Admin Menu" (1.3.4) by AlliedModders LLC
"Basic Commands" (1.3.4) by AlliedModders LLC
"Admin Help" (1.3.4) by AlliedModders LLC
"Basic Ban Commands" (1.3.4) by AlliedModders LLC
"Anti-Flood" (1.3.4) by AlliedModders LLC
"Client Preferences" (1.3.4) by AlliedModders LLC
"Basic Chat" (1.3.4) by AlliedModders LLC

Code:

Mani Admin Plugin 2010 V1.2V VSP Orange, www.mani-admin-plugin.com
Server Tickrate 67
Linux server

[BehaartesEtwas]

http://wiki.fragaholics.de/index.php/EN:Server_FAQ#My_CPU_usage_is_too_high.2C_what_can_I_do_about_it.3F
(last entry)