KSM & Ballooning Question

[en4ble]

Hi,

QQ, I'm trying not to have any SWAP on the VMs why the system (PVE) was configured as ZFS without swap. I've noticed that VMs do have ballooning enabled. If there is no swap are they still able to use the storage from the VM itself for SWAP? Meaning I would probably have to disable it (0) on each VM?

In regards to KSM I am aware that it kicks in at 80% memory utilization by default. How big of a CPU impact does it introduces when its utilized?! Or is it hard to quantify?

Thank you in advance.

 

[spirit]

ballooning is not related to swap, so you can safely disable swap on host && guests vm.

ksm only use 1core max. (generally at 100% , but you can increase sleep value in ksm config file)

 

[LnxBil]

I always recommend using compressed ram as swap (zram).