Public bug reported:
Much as described in bug 1325560 I am experiencing issues with a KVM
guest losing network connectivity when under load.
I have a KVM host running Ubuntu 17.04 with linux-
image-4.10.0-22-generic (currently in zesty-proposed) installed.
On top of this I have a guest also running 17.04 also with the proposed
kernel (there was an issue with machine lockups on one of my other 17.04
machines with the standard linux-image-4.10.0-21-generic kernel
regarding swap and so I've updated all my 17.04 machines to -22).
The guest is running as a Ceph OSD host with 2 OSD processes. The Ceph
cluster shares out RBD images to other hosts.
When one of the hosts causes a lot of activity on the Ceph disks by, for
example, running btrfs scrub the network card on the system will
frequently stop.
The machine can see itself, but no other parts of the local network or
wider networks. No hosts on the local network can see the machine in
question.
Simply restarting the machine fixes the problem temporarily (i.e.
logging into the guest and issuing 'shutdown -r now' - the actual qemu
process remains the same).
** Affects: qemu-kvm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1694625
Title:
KVM Guest loses network connectivity under heavy load
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