ovs_be32 duration_sec; /* Time meter has been alive in seconds. */
ovs_be32 duration_nsec; /* Time meter has been alive in nanoseconds
beyond duration_sec. */
ovs_be32 duration_sec; /* Time meter has been alive in seconds. */
ovs_be32 duration_nsec; /* Time meter has been alive in nanoseconds
beyond duration_sec. */