Public bug reported: Severe degradation of network performance in VM with virtio-net on noble after upgrading from linux-image-6.8.0-51-generic to the current kernel version linux-image-6.8.0-53-generic.
Expected speed up to 10 Gbit/s Instead only up to 10 Mbit/s The Problem exists only on VMs not on host systems. Lots of the folling errors in dmesg: [ 35.486430] enp2s0: bad gso: type: 4, size: 1448 [ 35.750641] enp2s0: bad gso: type: 4, size: 1448 [ 38.390268] net_ratelimit: 9 callbacks suppressed [ 38.390276] enp2s0: bad gso: type: 4, size: 1448 [ 38.654318] enp2s0: bad gso: type: 4, size: 1448 [ 38.918270] enp2s0: bad gso: type: 4, size: 1448 [ 39.182372] enp2s0: bad gso: type: 4, size: 1448 [ 39.446477] enp2s0: bad gso: type: 4, size: 1448 [ 39.710402] enp2s0: bad gso: type: 4, size: 1448 [ 39.974488] enp2s0: bad gso: type: 4, size: 1448 [ 40.238648] enp2s0: bad gso: type: 4, size: 1448 [ 40.502357] enp2s0: bad gso: type: 4, size: 1448 [ 40.766495] enp2s0: bad gso: type: 4, size: 1448 [ 43.406820] net_ratelimit: 9 callbacks suppressed When downgrading to linux-image-6.8.0-51-generic the problem disappers. In our Setup we use a bridge in the host system to connect the VMs directly to the network. Inside the VMs we use macvlan to provide networking for systemd-nspawn containers. Look very similar to this fixed bug report on jammy: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2089012 cat /proc/version_signature > version.log Ubuntu 6.8.0-53.55-generic 6.8.12 lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04.2 LTS Release: 24.04 apt-cache policy linux-image-virtual linux-image-virtual: Installed: 6.8.0-53.55+1 Candidate: 6.8.0-53.55+1 Version table: *** 6.8.0-53.55+1 500 500 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 100 /var/lib/dpkg/status 6.8.0-52.53 500 500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages 6.8.0-31.31 500 500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: noble ** Attachment added: "apport" https://bugs.launchpad.net/bugs/2098973/+attachment/5859056/+files/apport.linux-image-6.8.0-53-generic.97omhx33.apport -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2098973 Title: Severe degradation of network performance virtio-net bad gso: type: 4 Status in linux package in Ubuntu: New Bug description: Severe degradation of network performance in VM with virtio-net on noble after upgrading from linux-image-6.8.0-51-generic to the current kernel version linux-image-6.8.0-53-generic. Expected speed up to 10 Gbit/s Instead only up to 10 Mbit/s The Problem exists only on VMs not on host systems. Lots of the folling errors in dmesg: [ 35.486430] enp2s0: bad gso: type: 4, size: 1448 [ 35.750641] enp2s0: bad gso: type: 4, size: 1448 [ 38.390268] net_ratelimit: 9 callbacks suppressed [ 38.390276] enp2s0: bad gso: type: 4, size: 1448 [ 38.654318] enp2s0: bad gso: type: 4, size: 1448 [ 38.918270] enp2s0: bad gso: type: 4, size: 1448 [ 39.182372] enp2s0: bad gso: type: 4, size: 1448 [ 39.446477] enp2s0: bad gso: type: 4, size: 1448 [ 39.710402] enp2s0: bad gso: type: 4, size: 1448 [ 39.974488] enp2s0: bad gso: type: 4, size: 1448 [ 40.238648] enp2s0: bad gso: type: 4, size: 1448 [ 40.502357] enp2s0: bad gso: type: 4, size: 1448 [ 40.766495] enp2s0: bad gso: type: 4, size: 1448 [ 43.406820] net_ratelimit: 9 callbacks suppressed When downgrading to linux-image-6.8.0-51-generic the problem disappers. In our Setup we use a bridge in the host system to connect the VMs directly to the network. Inside the VMs we use macvlan to provide networking for systemd-nspawn containers. Look very similar to this fixed bug report on jammy: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2089012 cat /proc/version_signature > version.log Ubuntu 6.8.0-53.55-generic 6.8.12 lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04.2 LTS Release: 24.04 apt-cache policy linux-image-virtual linux-image-virtual: Installed: 6.8.0-53.55+1 Candidate: 6.8.0-53.55+1 Version table: *** 6.8.0-53.55+1 500 500 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages 100 /var/lib/dpkg/status 6.8.0-52.53 500 500 http://security.ubuntu.com/ubuntu noble-security/main amd64 Packages 6.8.0-31.31 500 500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2098973/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
