High Swap usage
- Thread starter telvenes
- Start date
Used swap doesn't necessarily has to be a bad thing. See this nice writeup [0].
If you have performance issues you can try if disabling the swap helps.
Disable swap:
We know of customers where this was the case.
There is no general recommendation from our side as, with most things in life, it depends (on the hardware, load, ...). However you can run
[0] https://chrisdown.name/2018/01/02/in-defence-of-swap.html
If you have performance issues you can try if disabling the swap helps.
Disable swap:
swapoff -a then reboot the nodeWe know of customers where this was the case.
There is no general recommendation from our side as, with most things in life, it depends (on the hardware, load, ...). However you can run
top command to see what the service take the swap[0] https://chrisdown.name/2018/01/02/in-defence-of-swap.html
I have one Proxmox (with ZFS) that does not use swap unless I backup a VM with cache=writeback, then it fills the swap completely and makes everything slow. I have another Proxmox (without ZFS, with only containers running) that puts 35% of the used memory in swap, but it is never slow. Both systems have vm.swappiness=10. It is really unclear why Linux does what it does with swap and when... Although the two systems swap usage is completely different, both work fine (as long as I don't use cache=writeback for VMs).
