** Also affects: linux (Ubuntu Xenial)
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Cannot set MTU higher than 1500 in Xen instance
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
The latest Xenial update has broken MTU functionality in Xen: specifically,
setting MTUs larger than 1500 fails. This prevents Jumbo Frames and other
features which require larger than 1500 byte MTUs from being used. This can
lead to a failure to sync/connect to other components in the cluster/cloud
which expect higher MTUs and result in unavailable services.
This can be worked around by manually using ethtool to set SCATTER/GATHER
- $ sudo ethtool -K $interface_name sg on
The issue is caused by the following commit to the xen-netfront driver:
"xen-netfront: Fix race between device setup and open"
Reverting the above fix has confirmed that the problem goes away.
The following commits fix this issue in the mainline kernel:
"xen-netfront: Fix mismatched rtnl_unlock"
"xen-netfront: Update features after registering netdev"
1. Launch a Xen instance using the latest kernel version (e.g. 4.4.0-130,
2. Change MTU to 9000 or other value > 1500.
The kernel patch might not be able to set MTU.
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