[SOLVED] KSM sharing seems not to work after 5.2->5.3

[yarick123]

Hello!

Thank you for the superior product!

I have just upgraded the cluster from version 5.2 to the version 5.3 .

Spoiler: pveversion -v

proxmox-ve: 5.3-1 (running kernel: 4.15.18-9-pve)
pve-manager: 5.3-5 (running version: 5.3-5/97ae681d)
pve-kernel-4.15: 5.2-12
pve-kernel-4.15.18-9-pve: 4.15.18-30
pve-kernel-4.15.18-7-pve: 4.15.18-27
pve-kernel-4.15.18-5-pve: 4.15.18-24
pve-kernel-4.15.18-1-pve: 4.15.18-19
pve-kernel-4.15.17-3-pve: 4.15.17-14
pve-kernel-4.15.17-2-pve: 4.15.17-10
pve-kernel-4.15.17-1-pve: 4.15.17-9
corosync: 2.4.4-pve1
criu: 2.11.1-1~bpo90
glusterfs-client: 3.8.8-1
ksm-control-daemon: 1.2-2
libjs-extjs: 6.0.1-2
libpve-access-control: 5.1-3
libpve-apiclient-perl: 2.0-5
libpve-common-perl: 5.0-43
libpve-guest-common-perl: 2.0-18
libpve-http-server-perl: 2.0-11
libpve-storage-perl: 5.0-33
libqb0: 1.0.3-1~bpo9
lvm2: 2.02.168-pve6
lxc-pve: 3.0.2+pve1-5
lxcfs: 3.0.2-2
novnc-pve: 1.0.0-2
proxmox-widget-toolkit: 1.0-22
pve-cluster: 5.0-31
pve-container: 2.0-31
pve-docs: 5.3-1
pve-edk2-firmware: 1.20181023-1
pve-firewall: 3.0-16
pve-firmware: 2.0-6
pve-ha-manager: 2.0-5
pve-i18n: 1.0-9
pve-libspice-server1: 0.14.1-1
pve-qemu-kvm: 2.12.1-1
pve-xtermjs: 1.0-5
qemu-server: 5.0-43
smartmontools: 6.5+svn4324-1
spiceterm: 3.0-5
vncterm: 1.5-3

I noticed, that KSM sharing seemed not to work any more - on the dashboard in the Summary I saw always "
KSM sharing 0 B".

As I migrated form version 4.4 to 5.2 I experienced the same problem. To fix it, I installed and configured additional packages to turn on KSM sharing.

I checked that the installed package was there and ksmtuned works:

Spoiler: systemctl status ksmtuned

* ksmtuned.service - Kernel Samepage Merging (KSM) Tuning Daemon
Loaded: loaded (/lib/systemd/system/ksmtuned.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2018-12-17 13:25:24 CET; 2 days ago
Process: 877 ExecStart=/usr/sbin/ksmtuned (code=exited, status=0/SUCCESS)
Main PID: 941 (ksmtuned)
Tasks: 2 (limit: 4915)
Memory: 5.6M
CPU: 48.014s
CGroup: /system.slice/ksmtuned.service
|- 941 /bin/bash /usr/sbin/ksmtuned
`-22858 sleep 60

Have anyone an idea, what can be wrong?

Best regards
yarick123

 

[spirit]

ksm begin to scan memory when you reach 80% memory usage.

So maybe you simply have rebooted, and not using yet 80% memory ?

 

[yarick123]

Thank you @spirit!

That was it! After starting some more vms ksm sharing started to work!