TT_HS_OVERHEAD
if (bw_table->bw_used + TT_HS_OVERHEAD > HS_BW_LIMIT)
bw_used += TT_HS_OVERHEAD *
rh_bw_info->bw_table.bw_used += TT_HS_OVERHEAD;
rh_bw_info->bw_table.bw_used -= TT_HS_OVERHEAD;