On Wed, Dec 4, 2019 at 6:15 PM <klaasdem...@gmail.com> wrote: > > Hi, > > I'm having performance issues with a ovirt installation. It is showing > high steal (5-10%) for a cpu intensive VM. The hypervisor however has > more than 65% of his resources idle while the steal is seen inside of > the VM. > > Even when placing only a single VM on a hypervisor it still receives > steal (0-2%), even though the hypervisor is not overcommited. > > > Hypervisor: > > 2 Socket system in total 2*28(56HT) cores > > > VM: > > 30vCPUs (ovirt seems to think its a good idea to make that 15 sockets * > 2 cores)
I think you can control this in oVirt. > My questions are: > > a) Could it be that the hypervisor is trying to schedule all 30 cores on > a single numa node, ie using the HT cores instead of "real" ones and > this shows up as steal? > > b) Do I need to make VMs this big numa-aware and spread the vm over both > numa nodes? > > c) Would using the High Performance VM type help in this kind of situation? > > d) General advise: how do I reduce steal in an environment where the > hypervisor has idle resources > > > Any advise would be appreciated. These questions are mainly about qemu, so adding qemu-discuss. I think it will help if you share your vm qemu command line, found in: /var/log/libvit/qemu/vm-name.log Nir _______________________________________________ Users mailing list -- users@ovirt.org To unsubscribe send an email to users-le...@ovirt.org Privacy Statement: https://www.ovirt.org/site/privacy-policy/ oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/4RBWYLKGCXAGOSC7FM3UMPE5T3JHOQKV/
