i40e/i40evf: Update code to better handle incrementing page count
Update the driver code so that we do bulk updates of the page reference count instead of just incrementing it by one reference at a time. The advantage to doing this is that we cut down on atomic operations and this in turn should give us a slight improvement in cycles per packet. In addition if we eventually move this over to using build_skb the gains will be more noticeable. I also found and fixed a store forwarding stall from where we were assigning "*new_buff = *old_buff". By breaking it up into individual copies we can avoid this and as a result the performance is slightly improved. Change-ID: I1d3880dece4133eca3c32423b04a5467321ccc52 Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com> Tested-by: NAndrew Bowers <andrewx.bowers@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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