On 30 January 2017 at 22:17, Adi Pircalabu <adi@ddns.com.au> wrote:

May I chip in here? In our environment we're randomly seeing:

Jan 17 23:40:14 xen01 kernel: ixgbe 0000:04:00.1 eth6: Detected Tx Unit Hang

Someone in this thread: https://sourceforge.net/p/e1000/bugs/530/#2855 reported that "With these kernels I was only able to work around the issue by disabling tx-checksumming offload with ethtool."

However, that was reported for Kernels 4.2.6 / 4.2.8 / 4.4.8 and 4.4.10. I just thought it could be something you could rule out and hence mentioned it:

ethtool --offload eth6 rx off tx off

Another thing to rule out in case its a regression with Intel NICs and TSO:

# tso => tcp-segmentation-offload
# gso => generic-segmentation-offload
# gro => generic-receive-offload
# sg => scatter-gather
# ufo => udp-fragmentation-offload (Cannot change)
# lro => large-receive-offload (Cannot change)

ethtool -K eth6 tso off gso off gro off sg off