On 12/12/2014 14:00, Carew, Alan wrote: > The problem is deterministic control of host CPU frequency and the DPDK usage > model. > A hands-off power governor will scale based on workload, whether this is a > host > application or VM, so no problems or bug there. > > Where this solution fits is where an application wants to control its own > power policy, for example l3fwd_power uses librte_power library to change > frequency via apci_cpufreq based on application heuristics rather than > relying on an inbuilt policy for example ondemand or performance. > > This ability has existed in DPDK for host usage for some time and VM power > management allows this use case to be extended to cater for virtual machines > by re-using the librte_power interface to encapsulate the VM->Host > comms and provide an example means of managing such communications. > > I hope this clears it up a bit.
Ok, this looks specific enough that an out-of-band solution within DPDK sounds like the best approach. It seems unnecessary to involve the hypervisor (neither KVM nor QEMU). Paolo
