Comment 0 for bug 1720126

I've ran into an issue when creating a large number of virtual functions on a SR-IOV capable device.

ip link show reports a message truncated error:
ip link show > /dev/null
Message truncated
Message truncated
Message truncated

A likely cause might be that when called in a system where the number of PCIe Virtual Functions are more than 30 for a given Physical Function, the netlink response is larger than 16K, meaning that a message is truncated.

The issue is seen with Ubuntu14.04 and Ubuntu16.04.

A possible solution for the issue is to increase the size of the receive buffer in libnetlink.c

Additional information:
=====================================================================================================
Ubuntu16 system

stack@cluster04:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial

stack@cluster04:~$ uname -r
4.4.0-93-generic

stack@cluster04:~$ apt-cache policy iproute2
iproute2:
  Installed: 4.3.0-1ubuntu3.16.04.1
Version table:
*** 4.3.0-1ubuntu3.16.04.1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
=================================================================================================

Ubuntu14 system:
root@boomslang:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

root@boomslang:~# uname -r
4.4.0-96-generic

root@boomslang:~# apt-cache policy iproute2
iproute2:
  Installed: 3.12.0-2ubuntu1
  Version table:
 *** 3.12.0-2ubuntu1 0
        500 http://za.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages