Hi, indeed this seems like a kernel issue - let me re-assign the bug so it is actually seen by the Kernel folks.
Thanks for all the testing already - indeed it has many similarities with 2098961 and might end up as duplicate. There they even bisected the case, you can try the builds linked to there and if they behave the same good/bad we can assume it is indeed the same. If it is this can be marked as a dup ** Package changed: kvm (Ubuntu) => linux (Ubuntu) -- 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/2100717 Title: Networking speed is slow on KVM Virtual Machine running upgraded Ubuntu 22.04.02 Software Status in linux package in Ubuntu: New Bug description: It is a very strange problem. I have a new DELL PowerEdge R470 installed with Ubuntu 24.04 updated to the last level (at the time 24.04.02 / 6.8.0-54-generic). The DELL PowerEdge R470 has a bridge and KVM installed. If I start a new virtual machine with vanilla Ubuntu 24.04.0, everything is fine, also with Ubuntu 22.04.xx virtual machines the situation is OK. But as soon as I update an Ubuntu 24.04 VM (with apt update && apt upgrade) the networking speed after the reboot of the VM is tremendously slow. It plummets to 50 KB/s for all protocols (http, ssh ecc.) both in uplad and downalod. This problem affect only the upgraded virtual machine, the others VM are still fast. The strange thing is if I migrate the VM to another host (same configuration of Ubuntu/KVM/Bridge) the VM is OK, and if a return the VM to the orginal host the problem presents itself again. The problem is reproducible with: virt-install \ -n srv-test \ --description "Paperless Delivery Notes" \ --os-variant=ubuntu24.04 \ --ram=4096 \ --vcpus=4 \ --disk path=/kvm/images/srv-test/srv-test.qcow2,format=qcow2,bus=virtio,size=200 \ --network bridge:br0 \ --graphics vnc,listen=0.0.0.0,port=5901 \ --noautoconsole \ --autostart \ --cdrom /kvm/iso/ubuntu-24.04-live-server-amd64.iso To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2100717/+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
