RAM usage is higher

[powersupport]

Hi,

We have a proxmox cluster with 4 nodes, recently, we have noticed that the RAM is higher in the nodes, but there is only one VM in the nodes with less memory usage, while testing, I just tried to disable hotplug memory on the VM and rebooted the same, then I see the node memory usage went to normal, can anyone advice on this?

Thank you.

 

[dcsapak]

can you post the config of the vm (when the problem occurs) and the output of 'free' from inside the vm ?

 

[powersupport]

HI,
please see the below details

Free -m

total used free shared buff/cache available
Mem: 32011 1003 28261 176 2746 30445
Swap: 4095 0 4095

top - 01:06:34 up 1 day, 10:02,  1 user,  load average: 0.00, 0.01, 0.05
Tasks: 156 total,   1 running, 155 sleeping,   0 stopped,   0 zombie
%Cpu(s):  4.6 us,  1.5 sy,  0.0 ni, 92.3 id,  0.0 wa,  0.0 hi,  1.5 si,  0.0 st
KiB Mem : 32780172 total, 28956088 free,  1010820 used,  2813264 buff/cache
KiB Swap:  4194300 total,  4194300 free,        0 used. 31192156 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
11993 psaadm    20   0  503908  32132  21456 S  20.0  0.1   1:59.58 sw-engine-fpm: pool plesk
 4501 root      20   0  162108   2176   1460 R   6.7  0.0   0:00.01 top -cd3
    1 root      20   0   51752   3944   2516 S   0.0  0.0   0:36.18 /usr/lib/systemd/systemd --switched-root --system --deserialize 22
    2 root      20   0       0      0      0 S   0.0  0.0   0:00.06 [kthreadd]
    4 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 [kworker/0:0H]
    6 root      20   0       0      0      0 S   0.0  0.0   0:00.72 [ksoftirqd/0]
    7 root      rt   0       0      0      0 S   0.0  0.0   0:00.30 [migration/0]
    8 root      20   0       0      0      0 S   0.0  0.0   0:00.00 [rcu_bh]
    9 root      20   0       0      0      0 S   0.0  0.0   1:26.74 [rcu_sched]
   10 root       0 -20       0      0      0 S   0.0  0.0   0:00.00 [lru-add-drain]
   11 root      rt   0       0      0      0 S   0.0  0.0   0:00.69 [watchdog/0]

Thank you.

 

[dcsapak]

can you post the complete vm config?
on the cli:

qm config ID

 

[djzoidberg]

Linux basically try to use your system as best.
"free" show you the real memory used and the amount of ram that can be cleaned faster.

Anyway you can force your pve to clear the ram cache running:
sync; echo 2 > /proc/sys/vm/drop_caches

 

[powersupport]

Please see the below VM config details


agent: 1
boot: c
bootdisk: scsi0
cores: 4
hotplug: disk,network,usb,cpu
ide2: none,media=cdrom
memory: 32768
name: readyspace.com.my
net0: virtio=2A:F9:3B:95:A3:9D,bridge=vmbr0,firewall=1,rate=12.5
numa: 1
ostype: l26
scsi0: rbd-vm:vm-106-disk-0,discard=on,size=200G
scsihw: virtio-scsi-pci
smbios1: uuid=e9c95573-bddd-4268-9424-495c5ad3257d
sockets: 1
vmgenid: df391573-84c7-49d4-9209-0e41431984e1