I've observed that oVirt considers cache/buffer memory as "used". So a host can report, for example, 10% memory utilisation when hosting 0 VMs. A reboot of the host will of course free all that memory and the host will again report something close to 0%. This caused me a shock a few weeks ago when I thought my cluster was running out of memory. Given that the kernel will give back the buffer memory as required, is it not perhaps a bit misleading to count it as "used"? ---- On Fri, 13 Mar 2020 17:47:34 +0000 Michal Skrivanek <michal.skrivanek(a)redhat.com&gt; wrote ---- What’s wrong with it? _______________________________________________ Users mailing list -- mailto:users@ovirt.org To unsubscribe send an email to mailto:users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/FNYIXMSBRHV...

Maybe there is some subtlety here that I am missing? Taking one of my hosts as an example (running 4.2 - not sure if the code has changed in 4.3?) $ head -5 /proc/meminfo MemTotal:       263695240 kB MemFree:        80087284 kB MemAvailable:   137272368 kB Buffers:           79620 kB Cached:          7758272 kB While in the oVIrt GUI it reports 257514 MB total 172534 MB used 84980 MB free And from the Host page it reports memory utilisation as 67%, which roughly equates to used / total. (total - available) / total would give a value more like 50%. ---- On Mon, 16 Mar 2020 14:39:16 +0000 Michal Skrivanek <michal.skrivanek(a)redhat.com&gt; wrote ---- On 13 Mar 2020, at 18:55, Alan G <mailto:alan+ovirt@griff.me.uk> wrote: I've observed that oVirt considers cache/buffer memory as "used”. Where do you see that? So a host can report, for example, 10% memory utilisation when hosting 0 VMs. A reboot of the host will of course free all that memory and the host will again report something close to 0%. This caused me a shock a few weeks ago when I thought my cluster was running out of memory. Given that the kernel will give back the buffer memory as required, is it not perhaps a bit misleading to count it as "used"? it is not counted as used, https://github.com/oVirt/vdsm/blob/95d734bace00b87a17d333ac1871a489b18121...   ---- On Fri, 13 Mar 2020 17:47:34 +0000 Michal Skrivanek <mailto:michal.skrivanek@redhat.com> wrote ---- What’s wrong with it? _______________________________________________ Users mailing list -- mailto:users@ovirt.org To unsubscribe send an email to mailto:users-leave@ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/FNYIXMSBRHV... _______________________________________________ Users mailing list -- users(a)ovirt.org To unsubscribe send an email to users-leave(a)ovirt.org Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/users@ovirt.org/message/PMVQLLRAWYB...