ALTQ(4) alternate queuing of network packets


options ALTQ

options ALTQ_CBQ options ALTQ_RED options ALTQ_RIO options ALTQ_HFSC options ALTQ_CDNR options ALTQ_PRIQ


The 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 is implemented by the pfctl(8) utility, so please refer to the pfctl(8) and the pf.conf5 manpages for a complete description of the capabilities and how to use it.

Kernel Options

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

Enable .
Build the ``Class Based Queuing'' discipline.
Build the ``Random Early Detection'' extension.
Build ``Random Early Drop'' for input and output.
Build the ``Hierarchical Packet Scheduler'' discipline.
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.
Build the ``Priority Queuing'' discipline.
Required if the TSC is unusable.
Enable additional debugging facilities.

Note that -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 can be loaded as a module.


The driver modifications described in altq(9) are required to use a certain network card with . 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), nve(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 and thus all encapsulated drivers.

The tun(4) and ng_iface4 pseudo drivers also do support .