Guest Virtual Machines' Network Interfaces Become Unresponsive During Periods of High of Network Load (Doc ID 2246239.1)

Last updated on JULY 23, 2017

Applies to:

Oracle VM - Version 3.0.1 and later
Private Cloud Appliance - Version 1.0.1 and later
Linux x86-64

Symptoms

On Oracle Private Cloud Appliance and Oracle VM , a guest running the UEK3 or UEK4 Linux Kernel, during periods of intense network traffic to/from a Virtual Network Interface the network interface ceases functioning.  No explanatory messages are written to the /var/log/messages of the guest virtual machine.

The affected network interfaces stop processing network traffic.

If the VM is acting as an NFS Server,  NFS clients report they are no longer able to contact the NFS Server.

The issue can be worked around by disabling then re-enabling the network interface on the vm, for example:

This resumes normal network activity on that Virtual Network Interface.

It may be necessary to connect to the vm's console to achieve this, or connect via an unaffected virtual network interface.

Cause

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