What are the physical processors ? (Is it an numa architecture ? if yes, could be a memory bandwith problem)
Do you have tried to launch unixbench on the host to compare ? Maybe can you try to add +x2apic cpu flag ? It should reduce interrupts. (It's already in current qemu-server git) ----- Mail original ----- De: "Stefan Priebe - Profihost AG" <[email protected]> À: [email protected] Envoyé: Vendredi 19 Juillet 2013 09:07:27 Objet: [pve-devel] KVM with same cores as host is as slow as one core Hi, while benchmarking my kvm machines using unixbench i see the following reproducable behaviour. Host has 24 cores. KVM Machine set to 2 cores: Unixbench Value 2514 KVM Machine set to 16 cores: Unixbench Value 6714 KVM Machine set to 24 cores: Unixbench Value 1742 Also i see a max of 105% CPU Usage of the KVM process when setting the cores to 24. While i'm seeing more than 1000% setting it to 16 cores. Stefan _______________________________________________ pve-devel mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list [email protected] http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
