On 30 January 2017 at 22:17, Adi Pircalabu <adi at 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20170131/6ec8d152/attachment-0004.html>