We had load spikes issue on our server having OS ubuntu 9.04 with kernel 2.6.24-7-pve and pve-manager 1.3-1. Load used to reach to 4.0-5.0 multiple times in a day, without any Virutal Container running on the server. To resolve load spike issue, we have upgraded the system to proxmox kernel 2.6.24-10-pve and pve-manager: 1.5-8, but still same issue persist, even though there was no Virtual Container running. However, when we booted the system with the Ubuntu kernel 2.6.28-11-server the load average on the server is below 0.2. Server is having 2 Intel Quad Core i7 Xeon processor (Hyperthreaded so the OS sees a total of 16 processors) and 72GB DDR3 Memory. Please help me to figure out the issue and let me know if you need more information.