[SOLVED] Ram usage disparity between pve summary and pbs dashboard

[abranca]

Hi, i have a disparity in ram usage between pve summary and pbs dashboard.
My pbs is installed on vm and qemu-guest-agents are present and balloning is active.
I am attaching three pictures of the ram usage that confuse me and i do not understand which one is correct.

Thanks to all

PVE details:

proxmox-ve: 7.2-1 (running kernel: 5.13.19-6-pve)
pve-manager: 7.2-7 (running version: 7.2-7/d0dd0e85)
pve-kernel-5.15: 7.2-6
pve-kernel-helper: 7.2-6
pve-kernel-5.13: 7.1-9
pve-kernel-5.15.39-1-pve: 5.15.39-1
pve-kernel-5.15.35-3-pve: 5.15.35-6
pve-kernel-5.15.35-2-pve: 5.15.35-5
pve-kernel-5.15.35-1-pve: 5.15.35-3
pve-kernel-5.15.30-2-pve: 5.15.30-3
pve-kernel-5.13.19-6-pve: 5.13.19-15
pve-kernel-5.13.19-5-pve: 5.13.19-13
pve-kernel-5.13.19-4-pve: 5.13.19-9
pve-kernel-5.13.19-3-pve: 5.13.19-7
pve-kernel-5.13.19-2-pve: 5.13.19-4
ceph-fuse: 15.2.15-pve1
corosync: 3.1.5-pve2
criu: 3.15-1+pve-1
glusterfs-client: 9.2-1
ifupdown2: 3.1.0-1+pmx3
ksm-control-daemon: 1.4-1
libjs-extjs: 7.0.0-1
libknet1: 1.24-pve1
libproxmox-acme-perl: 1.4.2
libproxmox-backup-qemu0: 1.3.1-1
libpve-access-control: 7.2-4
libpve-apiclient-perl: 3.2-1
libpve-common-perl: 7.2-2
libpve-guest-common-perl: 4.1-2
libpve-http-server-perl: 4.1-3
libpve-storage-perl: 7.2-7
libspice-server1: 0.14.3-2.1
lvm2: 2.03.11-2.1
lxc-pve: 5.0.0-3
lxcfs: 4.0.12-pve1
novnc-pve: 1.3.0-3
proxmox-backup-client: 2.2.5-1
proxmox-backup-file-restore: 2.2.5-1
proxmox-mini-journalreader: 1.3-1
proxmox-widget-toolkit: 3.5.1
pve-cluster: 7.2-2
pve-container: 4.2-2
pve-docs: 7.2-2
pve-edk2-firmware: 3.20210831-2
pve-firewall: 4.2-5
pve-firmware: 3.5-1
pve-ha-manager: 3.4.0
pve-i18n: 2.7-2
pve-qemu-kvm: 6.2.0-11
pve-xtermjs: 4.16.0-1
qemu-server: 7.2-3
smartmontools: 7.2-pve3
spiceterm: 3.2-2
swtpm: 0.7.1~bpo11+1
vncterm: 1.7-1
zfsutils-linux: 2.1.4-pve1

PBS details:

proxmox-backup: 2.2-1 (running kernel: 5.15.39-1-pve)
proxmox-backup-server: 2.2.5-1 (running version: 2.2.5)
pve-kernel-5.15: 7.2-6
pve-kernel-helper: 7.2-6
pve-kernel-5.13: 7.1-9
pve-kernel-5.4: 6.4-7
pve-kernel-5.15.39-1-pve: 5.15.39-1
pve-kernel-5.15.35-2-pve: 5.15.35-5
pve-kernel-5.13.19-6-pve: 5.13.19-15
pve-kernel-5.13.19-2-pve: 5.13.19-4
pve-kernel-5.4.143-1-pve: 5.4.143-1
pve-kernel-5.4.65-1-pve: 5.4.65-1
ifupdown2: 3.1.0-1+pmx3
libjs-extjs: 7.0.0-1
proxmox-backup-docs: 2.2.5-1
proxmox-backup-client: 2.2.5-1
proxmox-mini-journalreader: 1.2-1
proxmox-widget-toolkit: 3.5.1
pve-xtermjs: 4.16.0-1
smartmontools: 7.2-pve3
zfsutils-linux: 2.1.4-pve1

 

[Matthias.]

I'd guess that's because of the cache. try echo 1 > /proc/sys/vm/drop_caches and compare the memory usage afterwards

PBS is aware of the cache and will leave it out, while PVE does not know of it.

 

[abranca]

perfect, in fact now the levels are consistent.
thank you!

 

[Matthias.]

Great! Please mark the thread as solved (click edit, there's a dropdown next to the title) so others with the same question find it more easily