Index: sys/dev/ixgbe/ixgbe.h
===================================================================
--- sys/dev/ixgbe/ixgbe.h
+++ sys/dev/ixgbe/ixgbe.h
@@ -162,8 +162,9 @@
  * modern Intel CPUs, results in 40 bytes wasted and a significant drop
  * in observed efficiency of the optimization, 97.9% -> 81.8%.
  */
-#define IXGBE_RX_COPY_LEN	160
-#define IXGBE_RX_COPY_ALIGN	(MHLEN - IXGBE_RX_COPY_LEN)
+#define IXGBE_RX_COPY_HDR_PADDED	((((MPKTHSIZE - 1) / 32) + 1) * 32)
+#define IXGBE_RX_COPY_LEN		(MSIZE - IXGBE_RX_COPY_HDR_PADDED)
+#define IXGBE_RX_COPY_ALIGN		(IXGBE_RX_COPY_HDR_PADDED - MPKTHSIZE)
 
 /* Keep older OS drivers building... */
 #if !defined(SYSCTL_ADD_UQUAD)