Dario Faggioli writes: > On Tue, 2019-07-30 at 17:33 +0800, Wanpeng Li wrote: >> However, in multiple VMs over-subscribe virtualization scenario, it >> increases >> the probability to incur vCPU stacking which means that the sibling >> vCPUs from >> the same VM will be stacked on one pCPU. I test three 80 vCPUs VMs >> running on >> one 80 pCPUs Skylake server(PLE is supported), the ebizzy score can >> increase 17% >> after disabling wake-affine for vCPU process. >> > Can't we achieve this by removing SD_WAKE_AFFINE from the relevant > scheduling domains? By acting on > /proc/sys/kernel/sched_domain/cpuX/domainY/flags, I mean? > > Of course this will impact all tasks, not only KVM vcpus. But if the > host does KVM only anyway... Even a host dedicated to KVM has many non-KVM processes. I suspect an increasing number of hosts will be split between VMs and containers. > > Regards -- Cheers, Christophe de Dinechin
