Adding Rik. Paolo On 20/04/2017 15:32, Gonglei (Arei) wrote: > Hi all, > > Currently, KVM do the CPU resource reservation by the cgroup mechanism > which can't do entire accurate separation because the capacity of the Linux > scheduler. Take the public cloud as an example, some customers rent one vm > with 8 CPUs paid by enough money, they want to get enough response > speed on CPU scheduling. So we (the cloud platform providers ) reserve 1GHz > CPU resources by cgroup for those VM's vcpu/pcpu. > > But the actual effects can't meet those requirements because the cgroup is > limiting share usage of other processes in order to attach the reservation proportion, > but the scheduler can't assure that. This mechanism is different with Xen, > We can directly change the CPU weight on Xen hypervisor so that we can > get entire accurate control on CPU resources based on accurate capacity (upper limit), > share (weight) and reservation. > > So my question is do we have a good method to do CPU reservation in KVM? > > Thanks, > -Gonglei > >
