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Here we go mitigations=off, KSM enabled but not active so far root@pve-node-03486:~# ./strace.sh 901 strace: Process 5349 attached strace: Process 5349 detached % time seconds usecs/call calls errors syscall ------ ----------- ----------- --------- --------- ---------------- 97.81...

Host reboot required?

Yes, this is correct output of the command you provided earlier root@pve-node-03486:~# cat ./ctrace.sh #/bin/bash VMID=$1 PID=$(cat /var/run/qemu-server/$VMID.pid) timeout 5 strace -c -p $PID grep '' /sys/fs/cgroup/qemu.slice/$VMID.scope/*.pressure for _ in {1..5}; do grep ''...

Here we go... root@pve-node-03486:~# uname -a Linux pve-node-03486 6.2.16-16-pve #1 SMP PREEMPT_DYNAMIC PMX 6.2.16-16 (2023-10-03T05:42Z) x86_64 GNU/Linux mitigations=off, KSM disabled (booted without KSM at all) root@pve-node-03486:~# ./ctrace.sh 901 strace: Process 5349 attached strace...

First of all: it's not supported and we use it on our own risk However you should really do your best to get split brain) a) PVE cluster controls that VM config file can be assign to only one node of cluster b) No talks about HA in such setup c) Don't set auto start VMs

Two small notes here: 1) cpu spikes and ICMP lost appear when dozen number of RDS 2019 users log in (5-10 and more) If I just boot up fresh Windows Server 2019 without RDS and work load neither CPU spikes nor ICMP reply lost observed 2) I used to install intel-microcodes on all my nodes

Just set number of votes = 2 to main node in cluster conf file. We use this in setups with main-backup nodes and zfs replication. In case main node fails u will have to modify cluster config to increase number of votes for second node manually

Unfortunately, PVE devs keep rejecting the requests to release 5.15 opt kernel for PVE8 even-though number of negative feedbacks on 6.2 kernel increase constantly

Why? Quite simple... I used to use KSM in my environment and there are lots of improvements in ZFS from version 2.1.11 (from version you mentioned). As was mentioned above, KSM is one of the key feature and from my perspective 8.x can not not be production ready without this be fully working...

Do you mind to compile it with latest zfs? And release as separate deb package?

@aaron any news? by the way, is there any change to build 5.15 kernel for PVE 8 for testing or build 6.2 with patch applied?

And bellow how ICPM response time spikes look

One more observation: Disabling KSM requires rebooting the host because stopping KSM service (and/or disabling it) does not really stop it. ksmd becomes ghost and cannot be killed (I didnt manage to kill it) This screen shows: kernel with mitigations=off and ksdtuned stopped and disabled (but...

Host1 - problems CPU(s) 56 x Intel(R) Xeon(R) CPU E5-2690 v4 @ 2.60GHz (2 Sockets) Kernel Version Linux 6.2.16-14-pve #1 SMP PREEMPT_DYNAMIC PMX 6.2.16-14 (2023-09-19T08:17Z) Intel-microcodes installed VM: W2019 (96GB RAM + 42 cores, NUMA) Host2 - problems CPU(s) 48 x Intel(R)...

Is there any plans to integrate full mail backup/restore in PGM? Something like: https://www.mailpiler.org/

Could you try to continuously ping your VM (from any other device in network) like gateway? Huge ping delay spikes are common for the topic issue. If you don't have any then probably there is something else interfere P.S. Do not ping from another VM on the same host P.S.S In my case before...

Well, now it looks reasonable Next, what about KSM? Have you disabled it?

If I am not mistaken mitigations=off is not applied What filesystem behind your root partition? In my case (zfs) i had to edit cmdfile file Check this post: https://forum.proxmox.com/threads/disable-spectre-meltdown-mitigations.112553/post-485863

If on your systems KSM is in use then try to disable it with "systemctl disable --now ksmtuned" on top of and cross-check that mitigations are really off with lscpu

@t.lamprecht Is there any progress on sorting out the degradation in KSM and huge performance (CPU 100% spikes) loss in Windows guests with 6.2 kernels?