Automatic memory allocation (ballooning) is implemented in pvestatd, which assigns memory to or reclaims memory from eligible VMs in order to reach a certain target memory usage on the host. The target is currently hardcoded at 80%. Users have reported [1] that this target is unnecessarily low on hosts with large amounts of RAM.
This patch series makes the ballooning target configurable. For this, it adds a new node config option `ballooning-target`. pvestatd then reads the target from that option. Some potential discussion points: - Is it OK to have this as a node option? I imagine some users may want to set different targets on different nodes. But other users may want to set one target for the whole cluster. Should we have a `ballooning-target` datacenter option that can be overridden by a `ballooning-target` node option? This might be overkill for such a simple option, though. - Instead of a `ballooning-target` option, should we go for some general `ballooning-settings` with a property string like `target=80`, in case we want to make other values (such as `$maxchange`, which is currently hardcoded at 100 MiB) configurable in the future too? - In a mixed-version cluster where node 1 has this patch series and node 2 doesn't yet, any attempt to change node 2's ballooning target from node 1's GUI will error out with `ballooning-target: property is not defined in schema`. This is not very nice, but not terrible either, as the error message is relatively descriptive. Still, is there an easy way to avoid this (checking client-side whether the option exists?) [1] https://bugzilla.proxmox.com/show_bug.cgi?id=2413 manager: Friedrich Weber (3): node: options: add config option for ballooning target fix #2413: pvestatd: read ballooning RAM usage target from node config ui: node options: allow editing the ballooning RAM usage target PVE/NodeConfig.pm | 8 ++++++++ PVE/Service/pvestatd.pm | 10 +++++++--- www/manager6/node/NodeOptionsView.js | 18 ++++++++++++++++++ 3 files changed, 33 insertions(+), 3 deletions(-) docs: Friedrich Weber (1): pvenode: document ballooning-target node option pvenode.adoc | 13 +++++++++++++ qm.adoc | 13 ++++++++----- 2 files changed, 21 insertions(+), 5 deletions(-) Summary over all repositories: 5 files changed, 54 insertions(+), 8 deletions(-) -- Generated by git-murpp 0.7.3 _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
