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I can confirm that with 6.2.16-14 problem still exists Setting "mitigations=off" the only solution @ProxmoxTeam Any progress on this issue? P.S Taking into consideration that KSM with kernel 6.x is broken on dual socket boards +1 vote to release 5.15 kernel

did you check dmesg output?

check /etc/hosts and update accordantly

Holly cow! My bad. You made my day. Thanks!

Sure all the screens are made from the node WITH CEPH binary installed (CEPH cluster node)

I had 3 nodes cluster with CEPH installed (several OSDs on each node) in network 10.63.210.0/24 for PVE (1Gb) and 10.10.10.0/24 for CEPH (10Gbe). It was OK until I added 4-th node to PVE cluster only from another network 10.63.200.0/24 (no CEPH/OSD on that node). PVE cluster is happy, CEPH...

On Windows guest we got ~ +10%

Try mitigations=off as workaround. It could compensate performance drop, especially under memory pressure

My VMs have "bios: ovmf" In my case setting "mitigations=off" did the trick but didn't make me happy

When I setup 1 VM per host I used to disable KSM on the node following this guide: https://pve.proxmox.com/wiki/Kernel_Samepage_Merging_(KSM)

@jens-maus have you tried to disable KSM on top of "mitigations=off" before VM start? in my setup there is no memory pressure within the VM, so KSM in inactive state

on my nodes is "Y" root@063-pve-04347:~# cat /sys/module/kvm_*/parameters/nested Y

Here we go: root@063-pve-04347:~# cat /etc/pve/qemu-server/6303.conf agent: 1 bios: ovmf boot: order=ide2;scsi0 sockets: 2 cores: 24 cpu: host numa: 1 ide2: none,media=cdrom machine: pc-i440fx-8.0 memory: 147456 meta: creation-qemu=8.0.2,ctime=1687984201 name: srv-term-mng.domain net0...

In our environment we so exactly the same. CPU spikes and ICMP ping losses + novnc console freeze with increasing number of RDP users logging into W2019. However setting mitigations=off helped (>50 users work fine on each W2019 vm) One more interesting thing. We could not reproduce an issue...

For the record: I had to do the following: 1. nano /etc/kernel/cmdfile -> root=ZFS=rpool/ROOT/pve-1 boot=zfs mitigations=off 2. proxmox-boot-tool refresh 3. reboot 4. Check with lscpu

R u sure it is correctly applied? Check with lscpu. Should be like this: root@063-pve-04347:~# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 46 bits physical, 48 bits virtual Byte Order: Little Endian CPU(s)...

We also noticed that problem appears more when >64Gb ram allocated (especially 128 and more) and more than 24 vCPUs P.S as I mentioned in another thread, setting "mitigations=off" helped (as workaround only!)

+1 for supporting 5.15 kernel with PVE 8

In my cluster with 3 pve 8, 6.2 kernel, vm 100% CPU spikes,vm packet loss and rare complete freeze, setting “mitigations=off” helped

Agreed. Its not an option for me either