dpif-netdev: Reorder elements in dp_netdev_rxq structure.

By reordering elements in dp_netdev_rxq structure, pad bytes and a hole
can be removed.

Before: structure size: 104, sum holes: 1, sum padbytes:4, cachelines:2
After : structure size:  96, sum holes: 0, sum padbytes:0, cachelines:2

Signed-off-by: Bhanuprakash Bodireddy <bhanuprakash.bodireddy@intel.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

lib/dpif-netdev.c

@@ -366,14 +366,14 @@ struct dp_netdev_rxq {
                                           pinned. OVS_CORE_UNSPEC if the
                                           queue doesn't need to be pinned to a
                                           particular core. */
+    unsigned intrvl_idx;               /* Write index for 'cycles_intrvl'. */
     struct dp_netdev_pmd_thread *pmd;  /* pmd thread that polls this queue. */
 
     /* Counters of cycles spent successfully polling and processing pkts. */
     atomic_ullong cycles[RXQ_N_CYCLES];
     /* We store PMD_RXQ_INTERVAL_MAX intervals of data for an rxq and then
        sum them to yield the cycles used for an rxq. */
     atomic_ullong cycles_intrvl[PMD_RXQ_INTERVAL_MAX];
-    unsigned intrvl_idx;               /* Write index for 'cycles_intrvl'. */
 };
 
 /* A port in a netdev-based datapath. */