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doc: announce ixgbe MTU setting limitation

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Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
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Wenzhuo Lu 2017-02-09 09:28:00 +08:00 committed by Ferruh Yigit
parent 31214d491b
commit 9aaa9954ee
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doc/guides/nics/ixgbe.rst
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@ -233,6 +233,15 @@ be calculated as follows:
In order to ensure valid results, it is recommended to poll every 4 minutes.
MTU setting
~~~~~~~~~~~
Although the user can set the MTU separately on PF and VF ports, the ixgbe NIC
only supports one global MTU per physical port.
So when the user sets different MTUs on PF and VF ports in one physical port,
the real MTU for all these PF and VF ports is the largest value set.
This behavior is based on the kernel driver behavior.
Supported Chipsets and NICs
---------------------------