Very bad NIC performance with 6.8.12-9 (bad gso: type: 4, size: 1448)

[EllerholdAG]

Hello,
we have 2 Ubuntu-Guest-VMs with massive network throughput problems.
If I try to download a file in this ubuntu guest from a debian guest (same internal network) Ill only get a few kb/s. The ubuntu guest has the HWE Kernel 6.8.0-58-generic.
If I migrate the ubuntu guest to the same PVE server as the debian guest, Ill get > 500 MB/s.

dmesg in the ubuntu guest shows

ens18: bad gso: type: 4, size: 1448

I think this error is the culprit: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2098961 . Workaround is: ethtool -K <NIC> rx-gro-hw off
Ive executed this on the PVE host for both NICs (LACP-Bonded together) and I get > 500 MB/s.

The same happens with a win 7 guest, but NOT with a win 11 guest or a debian guest (kernel 6.1.0-33-amd64) .

We have created a ticket in proxmox and Ill keep you updated when something changes.

Versions in use:

pveversion -v​

proxmox-ve: 8.4.0 (running kernel: 6.8.12-9-pve)
pve-manager: 8.4.1 (running version: 8.4.1/2a5fa54a8503f96d)
proxmox-kernel-helper: 8.1.1
proxmox-kernel-6.8: 6.8.12-9
proxmox-kernel-6.8.12-9-pve-signed: 6.8.12-9
proxmox-kernel-6.8.12-8-pve-signed: 6.8.12-8
proxmox-kernel-6.8.12-4-pve-signed: 6.8.12-4
ceph: 19.2.1-pve3
ceph-fuse: 19.2.1-pve3
corosync: 3.1.9-pve1
criu: 3.17.1-2+deb12u1
frr-pythontools: 10.2.1-1+pve2
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx11
ksm-control-daemon: 1.5-1
libjs-extjs: 7.0.0-5
libknet1: 1.30-pve2
libproxmox-acme-perl: 1.6.0
libproxmox-backup-qemu0: 1.5.1
libproxmox-rs-perl: 0.3.5
libpve-access-control: 8.2.2
libpve-apiclient-perl: 3.3.2
libpve-cluster-api-perl: 8.1.0
libpve-cluster-perl: 8.1.0
libpve-common-perl: 8.3.1
libpve-guest-common-perl: 5.2.2
libpve-http-server-perl: 5.2.2
libpve-network-perl: 0.11.2
libpve-rs-perl: 0.9.4
libpve-storage-perl: 8.3.6
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 6.0.0-1
lxcfs: 6.0.0-pve2
novnc-pve: 1.6.0-2
openvswitch-switch: 3.1.0-2+deb12u1
proxmox-backup-client: 3.4.0-1
proxmox-backup-file-restore: 3.4.0-1
proxmox-firewall: 0.7.1
proxmox-kernel-helper: 8.1.1
proxmox-mail-forward: 0.3.2
proxmox-mini-journalreader: 1.4.0
proxmox-offline-mirror-helper: 0.6.7
proxmox-widget-toolkit: 4.3.10
pve-cluster: 8.1.0
pve-container: 5.2.6
pve-docs: 8.4.0
pve-edk2-firmware: 4.2025.02-3
pve-esxi-import-tools: 0.7.3
pve-firewall: 5.1.1
pve-firmware: 3.15-3
pve-ha-manager: 4.0.7
pve-i18n: 3.4.2
pve-qemu-kvm: 9.2.0-5
pve-xtermjs: 5.5.0-2
qemu-server: 8.3.12
smartmontools: 7.3-pve1
spiceterm: 3.3.0
swtpm: 0.8.0+pve1
vncterm: 1.8.0
zfsutils-linux: 2.2.7-pve2

 

[fiona]

Hi,
the fix mentioned in the Launchpad issue, i.e. de37faf41ac55 ("bnxt_en: Fix GSO type for HW GRO packets on 5750X chips") is part of the 6.8.12-10-pve kernel, currently available in the no-subscription repository.