proxmox reports free memory not available

[silvered.dragon]

Hi to all,
in my KVM linux servers I have this similar memory usage

so free total memory is around 8Gb and available around 6Gb

In my proxmox gui I have the following usage

as you can see I think that this is showing not the available memory but thee free one, is this the correct behaviour?
with kvm windows servers memory in guest/host are similar
Many thanks

 

[t.lamprecht]

as you can see I think that this is showing not the available memory but thee free one, is this the correct behaviour?

Have you enabled "Balloon" in the VMs memory setting and are virtio driver installed in the Windows VMs? As witouth that the PVE host cannot do accurate memory accounting, and will count all touched memory as "Used", as it then does not has the information from the Guest Operating System about what's "used but available" (buff/cache) or "used and unavailable" (RSS/used).

 

[silvered.dragon]

Have you enabled "Balloon" in the VMs memory setting and are virtio driver installed in the Windows VMs? As witouth that the PVE host cannot do accurate memory accounting, and will count all touched memory as "Used", as it then does not has the information from the Guest Operating System about what's "used but available" (buff/cache) or "used and unavailable" (RSS/used).

thank you for your reply, with windows kvm servers I don't have any problems, this is happening only with kvm Linux. Baloon is enabled, I tried with fixed memory or different min memory too. If I'm correct with Linux kvm I don't have to install nothing for balooning to works. Am I right?

 

[BobhWasatch]

You have to install the guest agent.

ETA: Most linux distributions have it in their repositories.

 

[silvered.dragon]

You have to install the guest agent.

ETA: Most linux distributions have it in their repositories.

thank you for your reply, it is already installed on all linux guest and I can do

qm agent <vmid> ping

from the host without errors.

 

[timonych]

Can confirm it. Have a similliar problem with Debian in KVM with Proxmox inside. Guest agent is installed and started (Topicstarte's Screen shows IP Info). For me memory usage is High in Main Proxmox host and Low usage in Debian Proxmox KVM.