path: root/net/sched/Kconfig

# SPDX-License-Identifier: GPL-2.0-only
#
# Traffic control configuration.
#

menuconfig NET_SCHED
	bool "QoS and/or fair queueing"
	select NET_SCH_FIFO
	help
	  When the kernel has several packets to send out over a network
	  device, it has to decide which ones to send first, which ones to
	  delay, and which ones to drop. This is the job of the queueing
	  disciplines, several different algorithms for how to do this
	  "fairly" have been proposed.

	  If you say N here, you will get the standard packet scheduler, which
	  is a FIFO (first come, first served). If you say Y here, you will be
	  able to choose from among several alternative algorithms which can
	  then be attached to different network devices. This is useful for
	  example if some of your network devices are real time devices that
	  need a certain minimum data flow rate, or if you need to limit the
	  maximum data flow rate for traffic which matches specified criteria.
	  This code is considered to be experimental.

	  To administer these schedulers, you'll need the user-level utilities
	  from the package iproute2+tc at
	  <https://www.kernel.org/pub/linux/utils/net/iproute2/>.  That package
	  also contains some documentation; for more, check out
	  <http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2>.

	  This Quality of Service (QoS) support will enable you to use
	  Differentiated Services (diffserv) and Resource Reservation Protocol
	  (RSVP) on your Linux router if you also say Y to the corresponding
	  classifiers below.  Documentation and software is at
	  <http://diffserv.sourceforge.net/>.

	  If you say Y here and to "/proc file system" below, you will be able
	  to read status information about packet schedulers from the file
	  /proc/net/psched.

	  The available schedulers are listed in the following questions; you
	  can say Y to as many as you like. If unsure, say N now.

if NET_SCHED

comment "Queueing/Scheduling"

config NET_SCH_CBQ
	tristate "Class Based Queueing (CBQ)"
	help
	  Say Y here if you want to use the Class-Based Queueing (CBQ) packet
	  scheduling algorithm. This algorithm classifies the waiting packets
	  into a tree-like hierarchy of classes; the leaves of this tree are
	  in turn scheduled by separate algorithms.

	  See the top of <file:net/sched/sch_cbq.c> for more details.

	  CBQ is a commonly used scheduler, so if you're unsure, you should
	  say Y here. Then say Y to all the queueing algorithms below that you
	  want to use as leaf disciplines.

	  To compile this code as a module, choose M here: the
	  module will be called sch_cbq.

config NET_SCH_HTB
	tristate "Hierarchical Token Bucket (HTB)"
	help
	  Say Y here if you want to use the Hierarchical Token Buckets (HTB)
	  packet scheduling algorithm. See
	  <http://luxik.cdi.cz/~devik/qos/htb/> for complete manual and
	  in-depth articles.

	  HTB is very similar to CBQ regarding its goals however is has
	  different properties and different algorithm.

	  To compile this code as a module, choose M here: the
	  module will be called sch_htb.

config NET_SCH_HFSC
	tristate "Hierarchical Fair Service Curve (HFSC)"
	help
	  Say Y here if you want to use the Hierarchical Fair Service Curve
	  (HFSC) packet scheduling algorithm.

	  To compile this code as a module, choose M here: the
	  module will be called sch_hfsc.

config NET_SCH_ATM
	tristate "ATM Virtual Circuits (ATM)"
	depends on ATM
	help
	  Say Y here if you want to use the ATM pseudo-scheduler.  This
	  provides a framework for invoking classifiers, which in turn
	  select classes of this queuing discipline.  Each class maps
	  the flow(s) it is handling to a given virtual circuit.

	  See the top of <file:net/sched/sch_atm.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_atm.

config NET_SCH_PRIO
	tristate "Multi Band Priority Queueing (PRIO)"
	help
	  Say Y here if you want to use an n-band priority queue packet
	  scheduler.

	  To compile this code as a module, choose M here: the
	  module will be called sch_prio.

config NET_SCH_MULTIQ
	tristate "Hardware Multiqueue-aware Multi Band Queuing (MULTIQ)"
	help
	  Say Y here if you want to use an n-band queue packet scheduler
	  to support devices that have multiple hardware transmit queues.

	  To compile this code as a module, choose M here: the
	  module will be called sch_multiq.

config NET_SCH_RED
	tristate "Random Early Detection (RED)"
	help
	  Say Y here if you want to use the Random Early Detection (RED)
	  packet scheduling algorithm.

	  See the top of <file:net/sched/sch_red.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_red.

config NET_SCH_SFB
	tristate "Stochastic Fair Blue (SFB)"
	help
	  Say Y here if you want to use the Stochastic Fair Blue (SFB)
	  packet scheduling algorithm.

	  See the top of <file:net/sched/sch_sfb.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_sfb.

config NET_SCH_SFQ
	tristate "Stochastic Fairness Queueing (SFQ)"
	help
	  Say Y here if you want to use the Stochastic Fairness Queueing (SFQ)
	  packet scheduling algorithm.

	  See the top of <file:net/sched/sch_sfq.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_sfq.

config NET_SCH_TEQL
	tristate "True Link Equalizer (TEQL)"
	help
	  Say Y here if you want to use the True Link Equalizer (TLE) packet
	  scheduling algorithm. This queueing discipline allows the combination
	  of several physical devices into one virtual device.

	  See the top of <file:net/sched/sch_teql.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_teql.

config NET_SCH_TBF
	tristate "Token Bucket Filter (TBF)"
	help
	  Say Y here if you want to use the Token Bucket Filter (TBF) packet
	  scheduling algorithm.

	  See the top of <file:net/sched/sch_tbf.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_tbf.

config NET_SCH_CBS
	tristate "Credit Based Shaper (CBS)"
	help
	  Say Y here if you want to use the Credit Based Shaper (CBS) packet
	  scheduling algorithm.

	  See the top of <file:net/sched/sch_cbs.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_cbs.

config NET_SCH_ETF
	tristate "Earliest TxTime First (ETF)"
	help
	  Say Y here if you want to use the Earliest TxTime First (ETF) packet
	  scheduling algorithm.

	  See the top of <file:net/sched/sch_etf.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_etf.

config NET_SCH_TAPRIO
	tristate "Time Aware Priority (taprio) Scheduler"
	help
	  Say Y here if you want to use the Time Aware Priority (taprio) packet
	  scheduling algorithm.

	  See the top of <file:net/sched/sch_taprio.c> for more details.

	  To compile this code as a module, choose M here: the
	  module will be called sch_taprio.

config NET_SCH_GRED
	tristate "Generic Random Early Detection (GRED)"
	help
	  Say Y here if you want to use the Generic Random Early Detection
	  (GRED) packet scheduling algorithm for some of your network devices
	  (see the top of <file:net/sched/sch_red.c> for details and
	  references about the algorithm).

	  To compile this code as a module, choose M here: the
	  module will be called sch_gred.

config NET_SCH_DSMARK
	tristate "Differentiated Services marker (DSMARK)"
	help
	  Say Y if you want to schedule packets according to the
	  Differentiated Services architecture proposed in RFC 2475.
	  Technical information on this method, with pointers to associated
	  RFCs, is available at <http://www.gta.ufrj.br/diffserv/>.

	  To compile this code as a module, choose M here: the
	  module will be called sch_dsmark.

config NET_SCH_NETEM
	tristate "Network emulator (NETEM)"
	help
	  Say Y if you want to emulate network delay, loss, and packet
	  re-ordering. This is often useful to simulate networks when
	  testing applications or protocols.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_netem.

	  If unsure, say N.

config NET_SCH_DRR
	tristate "Deficit Round Robin scheduler (DRR)"
	help
	  Say Y here if you want to use the Deficit Round Robin (DRR) packet
	  scheduling algorithm.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_drr.

	  If unsure, say N.

config NET_SCH_MQPRIO
	tristate "Multi-queue priority scheduler (MQPRIO)"
	help
	  Say Y here if you want to use the Multi-queue Priority scheduler.
	  This scheduler allows QOS to be offloaded on NICs that have support
	  for offloading QOS schedulers.

	  To compile this driver as a module, choose M here: the module will
	  be called sch_mqprio.

	  If unsure, say N.

config NET_SCH_SKBPRIO
	tristate "SKB priority queue scheduler (SKBPRIO)"
	help
	  Say Y here if you want to use the SKB priority queue
	  scheduler. This schedules packets according to skb->priority,
	  which is useful for request packets in DoS mitigation systems such
	  as Gatekeeper.

	  To compile this driver as a module, choose M here: the module will
	  be called sch_skbprio.

	  If unsure, say N.

config NET_SCH_CHOKE
	tristate "CHOose and Keep responsive flow scheduler (CHOKE)"
	help
	  Say Y here if you want to use the CHOKe packet scheduler (CHOose
	  and Keep for responsive flows, CHOose and Kill for unresponsive
	  flows). This is a variation of RED which tries to penalize flows
	  that monopolize the queue.

	  To compile this code as a module, choose M here: the
	  module will be called sch_choke.

config NET_SCH_QFQ
	tristate "Quick Fair Queueing scheduler (QFQ)"
	help
	  Say Y here if you want to use the Quick Fair Queueing Scheduler (QFQ)
	  packet scheduling algorithm.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_qfq.

	  If unsure, say N.

config NET_SCH_CODEL
	tristate "Controlled Delay AQM (CODEL)"
	help
	  Say Y here if you want to use the Controlled Delay (CODEL)
	  packet scheduling algorithm.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_codel.

	  If unsure, say N.

config NET_SCH_FQ_CODEL
	tristate "Fair Queue Controlled Delay AQM (FQ_CODEL)"
	help
	  Say Y here if you want to use the FQ Controlled Delay (FQ_CODEL)
	  packet scheduling algorithm.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_fq_codel.

	  If unsure, say N.

config NET_SCH_CAKE
	tristate "Common Applications Kept Enhanced (CAKE)"
	help
	  Say Y here if you want to use the Common Applications Kept Enhanced
	  (CAKE) queue management algorithm.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_cake.

	  If unsure, say N.

config NET_SCH_FQ
	tristate "Fair Queue"
	help
	  Say Y here if you want to use the FQ packet scheduling algorithm.

	  FQ does flow separation, and is able to respect pacing requirements
	  set by TCP stack into sk->sk_pacing_rate (for localy generated
	  traffic)

	  To compile this driver as a module, choose M here: the module
	  will be called sch_fq.

	  If unsure, say N.

config NET_SCH_HHF
	tristate "Heavy-Hitter Filter (HHF)"
	help
	  Say Y here if you want to use the Heavy-Hitter Filter (HHF)
	  packet scheduling algorithm.

	  To compile this driver as a module, choose M here: the module
	  will be called sch_hhf.

config NET_SCH_PIE
	tristate "Proportional Integral controller Enhanced (PIE) scheduler"
	help