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Have you tried enable the jumbo frame support?
As extracted from the website
Jumbo Frames support is enabled by changing the MTU to a value larger than the default of 1500. The maximum value for the MTU is 16110. Use the ip command to increase the MTU size. For example: ip link set dev ethx mtu 9000 The maximum MTU setting for Jumbo Frames is 9710. This value coincides with the maximum Jumbo Frames size of 9728.https://www.kernel.org/doc/Documentation/networking/ixgbe.txt