[PVE-User] Intermittent NIC Connectivity after Host Upgrade to PVE

JR Richardson jmr.richardson at gmail.com
Thu Jul 11 14:00:05 CEST 2019

Oddly enough, there was another kernel update yesterday, so I updated and so far the intermittent network connectivity problem seems to have went away.
Problem appears on kernel: 4.15.18-17-pve but so far not on kernel: 4.15.18-18-pve.

The issue with the VirtIO NIC driver is still present on Win2016. Still have to run the Intel NIC on the VM.

I will do some more testing today and follow up.



Are you able to boot on a previous kernel and see if the problem returns ?


On Wed, 10 Jul 2019 at 16:06, JR Richardson <jmr.richardson at gmail.com>

> Hi All,
> I recently upgraded a host within a 4 Node Cluster from
> pve-manager/5.2-5/eb24855a (running kernel: 4.15.18-1-pve) to
> pve-manager/5.4-10/9603c337 (running kernel: 4.15.18-17-pve).
> I had several VMs running on the host node, some Win2016 Servers and
> Linux Servers. I migrated the VM off the host node, performed the
> upgrade, them migrated the VMs back to the upgraded host. All seemed
> to go well, next day I notices the Win2016 servers having intermittent
> network connectivity, Linux servers running fine. Performing
> continuous pings to Win2016 servers, the NIC were dropping for 45-60
> seconds every hour or so, time was not consistent. I was using VitIO
> for NICs.
> I did windows update and this crashed the NICs, would not come up. I
> downloaded the latest virtio-win-0.1.171.iso and updated drivers, This
> did restore the NICs n the VMs but still have the network drops. I
> switched the VM NICs to Intel E1000 and still have the network drops.
> I don't see anything in the host node logs or the Win2016 VM logs
> indicating why the network drops periodically. Could this be a PVE
> kernel issue? I think this is more of a Win2016 issue, maybe the Intel
> NIC driver, its using the embedded Windows driver from 2010. Should I
> try downloading the latest driver from Intel?
> Dell R710 host node NICs:
> Ethernet controller: Broadcom Limited NetXtreme II BCM5709 Gigabit
> Ethernet (rev 20)
> Ethernet controller: Intel Corporation 82576 Gigabit Network Connection
> (rev 01)
> The NIC on the host for VMs is Broadcom. But the Linux hosts do not
> experience any drops so i don't think this is a host node or host
> kernel issue but I'm not sure.
> I appreciate any guidance.
> Thanks.
> JR

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