Command Section
ALTQ(4)                FreeBSD Kernel Interfaces Manual                ALTQ(4)

     ALTQ - alternate queuing of network packets

     options ALTQ

     options ALTQ_CBQ
     options ALTQ_CODEL
     options ALTQ_RED
     options ALTQ_RIO
     options ALTQ_HFSC
     options ALTQ_CDNR
     options ALTQ_PRIQ
     options ALTQ_FAIRQ

     The ALTQ framework provides several disciplines for queuing outgoing
     network packets.  This is done by modifications to the interface packet
     queues.  See altq(9) for details.

     The user interface for ALTQ is implemented by the pfctl(8) utility, so
     please refer to the pfctl(8) and the pf.conf(5) manpages for a complete
     description of the ALTQ capabilities and how to use it.

   Kernel Options
     The following options in the kernel configuration file are related to
     ALTQ operation:

     ALTQ            Enable ALTQ.
     ALTQ_CBQ        Build the ``Class Based Queuing'' discipline.
     ALTQ_CODEL      Build the ``Controlled Delay'' discipline.
     ALTQ_RED        Build the ``Random Early Detection'' extension.
     ALTQ_RIO        Build ``Random Early Drop'' for input and output.
     ALTQ_HFSC       Build the ``Hierarchical Packet Scheduler'' discipline.
     ALTQ_CDNR       Build the traffic conditioner.  This option is
                     meaningless at the moment as the conditioner is not used
                     by any of the available disciplines or consumers.
     ALTQ_PRIQ       Build the ``Priority Queuing'' discipline.
     ALTQ_FAIRQ      Build the ``Fair Queuing'' discipline.
     ALTQ_NOPCC      Required if the TSC is unusable.
     ALTQ_DEBUG      Enable additional debugging facilities.

     Note that ALTQ-disciplines cannot be loaded as kernel modules.  In order
     to use a certain discipline you have to build it into a custom kernel.
     The pf(4) interface, that is required for the configuration process of
     ALTQ can be loaded as a module.

     The driver modifications described in altq(9) are required to use a
     certain network card with ALTQ.  They have been applied to the following
     hardware drivers: ae(4), age(4), alc(4), ale(4), an(4), ath(4), aue(4),
     axe(4), bce(4), bfe(4), bge(4), bxe(4), cas(4), cxgbe(4), dc(4), de(4),
     ed(4), em(4), ep(4), epair(4), et(4), fxp(4), gem(4), hme(4), igb(4),
     ipw(4), iwi(4), ixgbe(4), jme(4), le(4), msk(4), mxge(4), my(4), nfe(4),
     nge(4), npe(4), qlxgb(4), ral(4), re(4), rl(4), rum(4), sf(4), sge(4),
     sis(4), sk(4), ste(4), stge(4), ti(4), txp(4), udav(4), ural(4), vge(4),
     vr(4), vte(4), wi(4), and xl(4).

     The ndis(4) framework also has support for ALTQ and thus all encapsulated

     The tun(4) and ng_iface(4) pseudo drivers also do support ALTQ.

     pf(4), pf.conf(5), ipfw(8), pfctl(8), altq(9)

FreeBSD 11.1-RELEASE-p4          July 24, 2015         FreeBSD 11.1-RELEASE-p4
Command Section