Thanks for the reply.
I monitored both our servers.
One is an Pentium4 2.8 with 1GB mem. CENTOS 5.1
2.6.18-53.el5xen #1 SMP i686 i686 i386 GNU/Linux
SERVER LOAD: FPS 43 MEMORY 476MB OUT 61 KBPS IN 3 KBPS
Now , I want to believe that this server is a little old, but was good enough to serv Arma1 and BF2.
The other one is hosted by server4you and is a little better.
Processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 107
model name : AMD Processor model unknown
stepping : 2
cpu MHz : 2109.750
cache size : 512 KB
4GB MEM. CENTOS 5.0
2.6.18-92.1.10.el5 #1 SMP x86_64 x86_64 x86_64 GNU/Linux
SERVER LOAD: FPS 4 to 6 MEM 430 to 431 OUT 83KBPS IN 19 KBPS
Now I can't believe I need more than that.
We hosted a Windows dedi arma2 on the AMD64 on VPAR without problems.
There must be something else as the standard missions like Civil War the AI is doing what they must do.
But COOP missions we made or Downloaded like co12_hijack_rev.utes.pbo and co12_spetsgruppa_dracul_v1_5.chernarus.pbo
don't run the AI scenario.
They just stand and do nothing.
I think this is not a hardware problem.