[one-users] CPU Issue

[Carsten.Friedrich at csiro.au]

As far as I can tell, for KVM, the CPU value is only used in the OpenNebula scheduler to prevent over-allocation. So, if you have defined the host as having 2 CPUs the scheduler will run e.g. 1 VM requesting CPU 2.0, or 2 VMs requesting CPU 1.0, or 4 VMs requesting CPU 0.5 (each) on this host. For KVM, it seems that once running on the hypervisor the CPU value is not enforced.

c

From: users-bounces at lists.opennebula.org [mailto:users-bounces at lists.opennebula.org] On Behalf Of Luca Lorenzini
Sent: Friday, 26 November 2010 3:59
To: users at lists.opennebula.org
Subject: [one-users] CPU Issue

I'm launching 3 vm with CPU=0.4 on a host dual core, but i noticed that the vms use more than 0.4 of the cpu. top command show me this:

PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
24274 root      20   0  577m 504m 2868 S   90 25.7   0:31.77 kvm
24964 root      20   0  577m 511m 2864 S   60 26.1   0:29.77 kvm
23724 root      20   0  577m 497m 2868 S   35 25.4   0:34.60 kvm

kvm use 90% of the cpu, not just 40%
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