Hi, I'd like you to take a look at this patch for potential DocImpact. https://review.openstack.org/14151 Log: commit 782e087950c768ddfe1310dddbdd6f8fe4478be6 Author: Yaguang Tang <yaguang.tang at canonical.com> Date: Sat Jan 19 23:44:05 2013 +0800 Add support for Server CPU Bandwidth IO quota. With the support of cgroup and traffic control, libvirt can limit instances's CPU, disk IO consumption. All these params can be set as instance type extra specs and be used by the kvm driver. wiki:http://wiki.openstack.org/InstanceResourceQuota DocImpact Implement blueprint quota-instance-resource Change-Id: I723c6df2579dd0161067fc5bf1c311f7ee66b3e9