X4 series adapters by default automatically negotiate the connection speed to the maximum supported by the link.
You can instead set the speed yourself:
- A value of “auto” instructs the adapter to use the highest link speed supported
by the inserted
module:
ethtool -s <interface> speed auto - Any other value fixes the link at that speed, regardless of the capabilities of
the link partner. This might result in an inability to establish the
link:
ethtool -s <interface> speed 25000