Hi, Am 19.07.2013 09:22, schrieb Alexandre DERUMIER: > 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)
Sorry ignore me. This seems to be a known bug: https://code.google.com/p/byte-unixbench/issues/detail?id=4 Stefan > ----- 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
