Today I have a recommendation for our Linux users under z/VM. There is a new performance paper available: z/VM 6.3 Resource Overcommitment.
Below is a short abstract:
This paper provides information about the performance of virtualized environments when operated with constrained resources. A z/VM based system installation runs a set of virtual systems of different types of workloads under Linux for System z. Another aspect analyzed was the efficiency of the z/VM paging subsystem when using EDEV-SCSI based paging devices, as opposed to ECKD based paging devices. It highlights the behavior of the new memory and CPU management introduced with z/VM 6.3.
The document is here.