Hi, memory overcommit in oVirt has a different meaning indeed.
oVirt tracks the amount of memory allocated to all running VMs and will not let you start an additional VM once the full capacity of the node is reached. The important thing to realize is that this is in no way related to the current memory consumption of a VM. This resource tracking is making sure all VMs will have enough memory on the node even if they all decide to use their full allocation at the same time. Memory overcommit in oVirt is exploiting the fact that the situation described above does not happen all that often. In fact, it almost does not happen at all, especially in the virtual desktop use case. So we let the user specify how much can the VM allocation grow above the physical memory capacity of a node (- some overhead for system and such). Does this make sense to you? Best regards -- Martin Sivak ex-oVirt maintainer :) On Tue, Feb 4, 2020 at 3:21 AM yam yam <hyunoo...@gmail.com> wrote: > > Hello, > > I thought memory overcommit feature in oVirt utilizes host's overcommit > features by manipulating kernel variables like vm.overcommit_ratio, > vm_overcommit_memory. > but, I've just confirmed that those variables didn't change at all. > > I wonder if oVirt's overcommit really has nothing to do with that of host > and if so, how does oVirt manage memory overcommit. > _______________________________________________ > 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/6JWQJUGCZ4NXB7HE7XA5WRRECNCFUKT7/ _______________________________________________ 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/NPXS74HQ52ZUALTUEGDA5JKDD7IYOSJ7/
