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ALTQ - alternate queuing of network packets
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.
The following options in the kernel configuration file are related to
ALTQ Enable ALTQ.
ALTQ_CBQ Build the “Class Based Queuing” 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_NOPCC Required for SMP builds.
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: an(4), ath(4), awi(4), bfe(4), bge(4), dc(4), de(4),
ed(4), em(4), fxp(4), hme(4), le(4), lnc(4), my(4), nve(4), re(4), rl(4),
sf(4), sis(4), sk(4), ste(4), stge(4), vr(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)