Slow Intel 10GbE CX4 adapter behaviour

[rihad]

On 02/09/2011 10:43 AM, Nikolay Denev wrote:
> I don't know if it's the same issue, but I had severe performance issues
> with ixgbe cards until I disable LRO (ifconfig ix0 -lro). That was on 7.2 too.
>

So did I, with LR-based cards. But CX4 cards don't mention LRO in their 
ifconfig enabled flags. Besides, ixgbe.c doesn't enable it by default:

         /* Don't enable LRO by default */
         ifp->if_capabilities |= IFCAP_LRO;