RQ_PPQ
if (td->td_base_pri + RQ_PPQ < PRI_MAX_ITHD) {
sched_prio(td, td->td_base_pri + RQ_PPQ);
if (td->td_base_pri + RQ_PPQ < PRI_MAX_ITHD) {
sched_prio(td, td->td_base_pri + RQ_PPQ);
#define RQ_NQS (howmany(RQ_MAX_PRIO + 1, RQ_PPQ)) /* Number of run queues. */
#define RQ_PRI_TO_QUEUE_IDX(pri) ((pri) / RQ_PPQ) /* Priority to queue index. */