On Sun, 27 Jan 2019 at 18:19, Nir Weiner <nir.weiner@xxxxxxxxxx> wrote: > > grow_halt_poll_ns() sets the halt_poll_ns value for a vCPU when growing - It has > significant effect on how vCPU performs. On the standard case, higher value is > better - we will spend more time in the polling busyloop, handle > events & interrupts faster and result in better performance for the VM. > But on outliers it puts us in a busy loop that does nothing. > > grow_halt_poll_ns() optimal algorithm changes between different workloads. > The changes in this patch series fixes 2 weird behaviors and exposes hard-coded > value which stands for the initial grow value in order to get a better > fine-tunning control. See the individual patches for more details. Please also post the performance number for your improvement. Regards, Wanpeng Li
