NAME
ALTQ —
alternate queuing of network
packets
SYNOPSIS
options ALTQ
options ALTQ_CBQ
options ALTQ_RED
options ALTQ_RIO
options ALTQ_HFSC
options ALTQ_PRIQ
options ALTQ_FAIRQ
options ALTQ_NOPCC
options ALTQ_DEBUG
DESCRIPTION
TheALTQ 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_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_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.