NXGE_MAXPSZ
#define NXGE_HIWAT (2048 * NXGE_MAXPSZ) /* hi-water mark */
#define NXGE_HIWAT_MAX (192000 * NXGE_MAXPSZ)
#define NXGE_HIWAT_MIN (2 * NXGE_MAXPSZ)
#define NXGE_LOWAT_MAX (192000 * NXGE_MAXPSZ)