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I have a KVM VPS with qcow2 + IDE Bus + Not Preallocated Disk and default network interface (no virtio). site is loading so slow and about 40% of ping replys are Time out.

I have CSF installed and even tried mod_evasive but no change.

so what do you think causes this problem? and how can I fix this?

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Why are you not using virtio drivers for disk and network? That should be the first thing you fix. –  Michael Hampton Sep 11 '12 at 8:51
    
Can you tcpdump the icmp on both guest and host node? something along: For guest: tcpdump -ni ethX icmp -v & on kvm node find out which bridge it's using and then tcpdump -ni itsbridgegoeshere icmp -v. –  3molo Sep 11 '12 at 8:51
    
@MichaelHampton I'll try that and will report back soon. –  Zim3r Sep 11 '12 at 8:54
    
@3olo, I'll provide tcpdump result in a few minutes –  Zim3r Sep 11 '12 at 8:56
    
This is the result: pastebin.com/VPc6S6fP Thanks –  Zim3r Sep 11 '12 at 9:25
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