Dear all, Recently, we made a few improvements on effectively utilizing Pause Loop Exiting (PLE) support for higher throughput on virtualized systems. Basically, it solves two problems: 1) how to adjust PLE_Window; 2) how to select virtual CPUs to schedule on VM_EXITs caused by PLE. Our tests with standard benchmarks show that the approach can improve performance by up to 49%. The approach shows promising performance and is easy to implement. We think that it would be wonderful if Linux/KVM and XEN can consider the approach. We already have a prototype implementation based on KVM (Linux Kernel 3.19.8). Our patch for Linux Kernel 3.19.8 and the paper describing our idea are available in Github repository [1][2][3]. We are pleased to revise our patch in order to merge it into Linux/KVM and XEN. We hope that you can test and adopt our approach/techniques. We are pleased to get some comments/suggestions on the approach and on how the idea can be adopted/tested by Linux/KVM and XEN. Thank you. [1] APPLES paper: https://github.com/sysmen/apples/tree/master/paper [2] APPLES patch: https://github.com/sysmen/apples/blob/master/patches/3.19.8-APPLES.patch [3] APPLES patch README: https://github.com/sysmen/apples/blob/master/patches/README.txt Best Regards, Sysmen Research Group
