I did some tests:

kernel-3.10.0-327.3.1.el7.x86_64 -> bond mode 4 doesn't work (if I detach one network cable the network is stable)
kernel-3.10.0-229.20.1.el7.x86_64 -> bond mode 4 works fine

Il 31/12/2015 9.44, Dan Kenigsberg ha scritto:
On Wed, Dec 30, 2015 at 09:39:12PM +0100, Stefano Danzi wrote:
Hi Dan,
some info about my network setup:

- My bond is used only for VM networking. ovirtmgmt has a dedicated ethernet
- I haven't set any ethtool opts.
I do not see anything suspecious here.

Which kernel version worked well for you?

Would it be possible to boot the machine with it, and retest bond mode
4, so that we can whole-heartedly place the blame on kernel?

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