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download PDF document: altq.4.pdf

ALTQ(4) FreeBSD Kernel Interfaces Manual ALTQ(4)
NAME ALTQ - alternate queuing of network packets
SYNOPSIS 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
DESCRIPTION The ALTQ system is a framework which 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) man pages 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.
SUPPORTED DEVICES 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), aue(4), axe(4), bce(4), bfe(4), bge(4), bxe(4), cas(4), dc(4), em(4), epair(4), et(4), fxp(4), gem(4), igb(4), ixgbe(4), jme(4), le(4), liquidio(4), msk(4), mxge(4), my(4), nfe(4), nge(4), npe(4), qlxgb(4), re(4), rl(4), sge(4), sis(4), sk(4), ste(4), stge(4), ti(4), udav(4), vge(4), vr(4), vte(4), and xl(4).
queue aq bandwidth 10Mb cbq
pass in on igb0.10 proto udp all queue aq keep state
SEE ALSO pf(4), pf.conf(5), ipfw(8), pfctl(8), altq(9)
HISTORY The ALTQ system first appeared in March 1997 and found home in the KAME project (https://www.kame.net). It was imported to FreeBSD in 5.3 .
FreeBSD 14.0-RELEASE-p11 November 10, 2022 FreeBSD 14.0-RELEASE-p11