GDT_MAXSG
/*maxsize*/MAXBSIZE, /*nsegments*/GDT_MAXSG,
#define GDT_CACHE_SZ (0x12 + GDT_MAXSG * GDT_SG_SZ)
#define GDT_RAW_SZ (0x3a + GDT_MAXSG * GDT_SG_SZ)
/*nsegments*/GDT_MAXSG,