RHEL5 ixgbevf driver cannot enable jumbo frames

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Issue

Unable to enable jumbo frame support on a network card using the ixgbevf driver. Setting the mtu to anything greater than 1504 returns:

# ip link set eth1 mtu 9000  
SIOCSIFMTU: Invalid argument

Environment

Red Hat Enterprise Linux 5
Intel Ethernet card using ixgbevf driver

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