| ALTQ(4) | Device Drivers Manual | ALTQ(4) | 
altq —
options ALTQ
options ALTQ_BLUE
options ALTQ_CBQ
options ALTQ_CDNR
options ALTQ_FIFOQ
options ALTQ_FLOWVALVE
options ALTQ_HFSC
options ALTQ_LOCALQ
options ALTQ_PRIQ
options ALTQ_RED
options ALTQ_RIO
options ALTQ_WFQ
altq system is a framework which provides several
  disciplines for queuing outgoing network packets. While traffic shaping is
  perhaps the most prominent example, altq provides also
  other measures related to QoS. The framework has been integrated to the
  pf(4) packet filter since
  NetBSD 4.0.
At the implementation level altq modifies
    the interface packet queues. Therefore the driver modifications described in
    altq(9) are required in order to
    use a certain network card with altq.
/dev/altq
Kenjiro Cho, Fitting theory into reality in the ALTQ case, http://www.sonycsl.co.jp/person/kjc/papers/fittingtheory.pdf, Taipei, Taiwan, March, 2004, Asia BSD conference.
altq system first appeared in March 1997 and found
  its home in the KAME project
  (http://www.kame.net). It was
  imported into NetBSD 1.6.
altq built in the kernel will not work.
| March 20, 2018 | NetBSD 10.0 |