i9-12900K - Poor performance in VM?

Maybe overhead? What QEMU/PVE-Version? What VM-Config?
 
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I beleive this is because the i9-12000k has

Performance Cores: 8 Cores, 16 Threads, 3.2 GHZ Base, 5.2 GHZ Turbo

Efficient Cores: 8 Cores, 8 Threads, 2.4 GHZ Base, 3.9 GHZ Turbo

How do I assign the virtual machine a performance core?

pveversion -v
Code: 
proxmox-ve: 7.1-2 (running kernel: 5.13.19-6-pve)
pve-manager: 7.1-12 (running version: 7.1-12/b3c09de3)
pve-kernel-helper: 7.2-2
pve-kernel-5.13: 7.1-9
pve-kernel-5.13.19-6-pve: 5.13.19-15
ceph-fuse: 14.2.21-1
corosync: 3.1.5-pve2
criu: 3.15-1+pve-1
glusterfs-client: 9.2-1
ifupdown: residual config
ifupdown2: 3.1.0-1+pmx3
ksm-control-daemon: 1.4-1
libjs-extjs: 7.0.0-1
libknet1: 1.22-pve2
libproxmox-acme-perl: 1.4.2
libproxmox-backup-qemu0: 1.2.0-1
libpve-access-control: 7.1-7
libpve-apiclient-perl: 3.2-1
libpve-common-perl: 7.1-5
libpve-guest-common-perl: 4.1-2
libpve-http-server-perl: 4.1-1
libpve-storage-perl: 7.1-2
libspice-server1: 0.14.3-2.1
lvm2: 2.03.11-2.1
lxc-pve: 4.0.12-1
lxcfs: 4.0.12-pve1
novnc-pve: 1.3.0-3
proxmox-backup-client: 2.1.6-1
proxmox-backup-file-restore: 2.1.6-1
proxmox-mini-journalreader: 1.3-1
proxmox-widget-toolkit: 3.4-10
pve-cluster: 7.1-3
pve-container: 4.1-5
pve-docs: 7.1-2
pve-edk2-firmware: 3.20210831-2
pve-firewall: 4.2-5
pve-firmware: 3.4-1
pve-ha-manager: 3.3-4
pve-i18n: 2.6-3
pve-qemu-kvm: 6.2.0-5
pve-xtermjs: 4.16.0-1
qemu-server: 7.1-5
smartmontools: 7.2-pve3
spiceterm: 3.2-2
swtpm: 0.7.1~bpo11+1
vncterm: 1.7-1

VM config:
Code: 
agent: 1
boot: c
bootdisk: scsi0
ciuser: root
cores: 1
cpu: host,flags=+aes
ide2: local:103/vm-103-cloudinit.qcow2,media=cdrom,size=4M
memory: 2048
name: testvpn
net0: virtio=FE:C8:73:50:8F:80,bridge=vmbr1,firewall=1
numa: 0
onboot: 1
scsi0: local:103/vm-103-disk-0.qcow2,size=33G
scsihw: virtio-scsi-pci
serial0: socket
smbios1: uuid=e2767702-ef0d-4885-b7f0-9ffa465fd0c1
sockets: 1
vga: serial0
vmgenid: 0f9bd87f-5dac-4bbe-8a3e-b4c053cb9944
 
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In WebGUI this is not possible. But I believe this can be done in VM-Config-File or maybe by CLI.
More a question for Proxmox-Staff or someone else who is using hardware like this.
 
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Does Proxmox do bug bounties? My organization needs with feature badly to and would love to contribute to a bounty.
 
I would say full support for alder lake has to be happen in the linux kernel in the first place.

Proxmox uses a modified ubuntu LTS kernel.
While the 5.15.35 kernel recently got a performance fix for alder lake [1] and the proxmox kernel is actually also on pve-5.15.35 (at least in the no-subscription repo) there is a chance that this fix is already included, but not sure there because afaik the version numbers don't necessarily match everytime.

More alder lake support/improvements in the linux kernel will come with 5.16+ [2] and especially 5.18 [3].

Besides this I am also eager if and what the proxmox team plans with these hybrid processors. :)

[1] https://www.phoronix.com/scan.php?page=article&item=linux-51535-adl
[2] https://www.phoronix.com/scan.php?page=article&item=adl-linux516-windows
[3] https://www.phoronix.com/scan.php?page=news_item&px=Intel-HFI-For-Linux-5.18
 
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