I reverted an affected VM to the old kernel and the speed is good again. The process I followed was:
- install an Ubuntu 24.04.00 KVM Virtual Machine - test speed -> OK with 6.8.0-31-generic - apt upgrade (more than 200 packages, kernel included) - test speed -> KO with 6.8.0-54-generic - remove the new kernel (apt remove --purge linux-image-6.8.0-54-generic) - test speed -> OK with 6.8.0-31-generic So it seems to be a kernel related bug. I think it something related to the Broadcom BCM57504 NetXtreme-E 10Gb/25Gb/50Gb/100Gb/200Gb Ethernet because it is the only component in common with bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2098961 These are the commands that I gave: root@srv-test:~# uname -a Linux srv-test 6.8.0-31-generic #31-Ubuntu SMP PREEMPT_DYNAMIC Sat Apr 20 00:40:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux root@srv-test:~# scp root@172.16.80.244:/root/harbor*gz . harbor-offline-installer-v2.12.2.tgz 100% 618MB 329.7MB/s 00:01 root@srv-test:~# apt update root@srv-test:~# apt upgrade root@srv-test:~# reboot root@srv-test:~# uname -a Linux srv-test 6.8.0-54-generic #56-Ubuntu SMP PREEMPT_DYNAMIC Sat Feb 8 00:37:57 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux root@srv-test:~# scp root@172.16.80.244:/root/harbor*gz . harbor-offline-installer-v2.12.2.tgz 100% 618MB 5.2MB/s 01:59 root@srv-test:~# dpkg --list | grep linux-image ii linux-image-6.8.0-31-generic 6.8.0-31.31 amd64 Signed kernel image generic ii linux-image-6.8.0-54-generic 6.8.0-54.56 amd64 Signed kernel image generic ii linux-image-generic 6.8.0-54.56 amd64 Generic Linux kernel image root@srv-test:~# apt remove --purge linux-image-6.8.0-54-generic root@srv-test:~# apt remove --purge linux-headers-6.8.0-54-generic root@srv-test:~# apt autoremove --purge root@srv-test:~# update-grub root@srv-test:~# reboot root@srv-test:~# uname -a Linux srv-test 6.8.0-31-generic #31-Ubuntu SMP PREEMPT_DYNAMIC Sat Apr 20 00:40:06 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux harbor-offline-installer-v2.12.2.tgz 100% 618MB 258.5MB/s 00:02 ** Tags added: regression-update -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2100717 Title: Networking speed is slow on KVM Virtual Machine running upgraded Ubuntu 22.04.02 Software To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kvm/+bug/2100717/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
