Public bug reported:
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
** Affects: kvm (Ubuntu)
Importance: Undecided
Status: New
** Tags: regression-update
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https://bugs.launchpad.net/bugs/2100717
Title:
Networking speed is slow on KVM Virtual Machine running upgraded
Ubuntu 22.04.02 Software
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