#
# Traffic control configuration.
#
menuconfig NET_SCHED
bool "QoS and/or fair queueing"
---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 packet
scheduler, and 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 <ftp://ftp.tux.org/pub/net/ip-routing/>.
That package also contains some documentation; for more, check out
<http://snafu.freedom.org/linux2.2/iproute-notes.html>.
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 "QoS support",
"Packet classifier API" and to some 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.
choice
prompt "Packet scheduler clock source"
depends on NET_SCHED
default NET_SCH_CLK_JIFFIES
help
Packet schedulers need a monotonic clock that increments at a static
rate. The kernel provides several suitable interfaces, each with
different properties:
- high resolution (us or better)
- fast to read (minimal locking, no i/o access)
- synchronized on all processors
- handles cpu clock frequency changes
but nothing provides all of the above.
config NET_SCH_CLK_JIFFIES
bool "Timer interrupt"
help
Say Y here if you want to use the timer interrupt (jiffies) as clock
source. This clock source is fast, synchronized on all processors and
handles cpu clock frequency changes, but its resolution is too low
for accurate shaping except at very low speed.
config NET_SCH_CLK_GETTIMEOFDAY
bool "gettimeofday"
help
Say Y here if you want to use gettimeofday as clock source. This clock
source has high resolution, is synchronized on all processors and
handles cpu clock frequency changes, but it is slow.
Choose this if you need a high resolution clock source but can't use
the CPU's cycle counter.
# don't allow on SMP x86 because they can have unsynchronized TSCs.
# gettimeofday is a good alternative
config NET_SCH_CLK_CPU
bool "CPU cycle counter"
depends on ((X86_TSC || X86_64) && !SMP) || ALPHA || SPARC64 || PPC64 || IA64
help
Say Y here if you want to use the CPU's cycle counter as clock source.
This is a cheap and high resolution clock source, but on some
architectures it is not synchronized on all processors and doesn't
handle cpu clock frequency changes.
The useable cycle counters are:
x86/x86_64 - Timestamp Counter
alpha - Cycle Counter
sparc64 - %ticks register
ppc64 - Time base
ia64 - Interval Time Counter
Choose this if your CPU's cycle counter is working properly.
endchoice
config NET_SCH_CBQ
tristate "CBQ packet scheduler"
depends on NET_SCHED
---help---
Say Y here if you want to use the Class-Based Queueing (CBQ) packet
scheduling algorithm for some of your network devices. 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 (called "disciplines" in this context).
See the top of <file:net/sched/sch_cbq.c> for references about the
CBQ algorithm.
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 CBQ disciplines. Then say Y to "Packet classifier
API" and say Y to all the classifiers you want to use; a classifier
is a routine that allows you to sort your outgoing traffic into
classes based on a certain criterion.
To compile this code as a module, choose M here: the
module will be called sch_cbq.
config NET_SCH_HTB
tristate "HTB packet scheduler"
depends on NET_SCHED
---help---
Say Y here if you want to use the Hierarchical Token Buckets (HTB)
packet scheduling algorithm for some of your network devices. See
<http://luxik.cdi.cz/~devik/qos/htb/> for complete manual and
in-depth articles.
HTB is very similar to the 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 "HFSC packet scheduler"
depends on NET_SCHED
---help---
Say Y here if you want to use the Hierarchical Fair Service Curve
(HFSC) packet scheduling algorithm for some of your network devices.
To compile this code as a module, choose M here: the
module will be called sch_hfsc.
#tristate ' H-PFQ packet scheduler' CONFIG_NET_SCH_HPFQ
config NET_SCH_ATM
tristate "ATM pseudo-scheduler"
depends on NET_SCHED && ATM
---help---
Say Y here if you want to use the ATM pseudo-scheduler. This
provides a framework for invoking classifiers (aka "filters"), 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>).
To compile this code as a module, choose M here: the
module will be called sch_atm.
config NET_SCH_PRIO
tristate "The simplest PRIO pseudoscheduler"
depends on NET_SCHED
help
Say Y here if you want to use an n-band priority queue packet
"scheduler" for some of your network devices or as a leaf discipline
for the CBQ scheduling algorithm. If unsure, say Y.
To compile this code as a module, choose M here: the
module will be called sch_prio.
config NET_SCH_RED
tristate "RED queue"
depends on NET_SCHED
help
Say Y here if you want to use the Random Early Detection (RED)
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_red.
config NET_SCH_SFQ
tristate "SFQ queue"
depends on NET_SCHED
---help---
Say Y here if you want to use the Stochastic Fairness Queueing (SFQ)
packet scheduling algorithm for some of your network devices or as a
leaf discipline for the CBQ scheduling algorithm (see the top of
<file:net/sched/sch_sfq.c> for details and references about the SFQ
algorithm).
To compile this code as a module, choose M here: the
module will be called sch_sfq.
config NET_SCH_TEQL
tristate "TEQL queue"
depends on NET_SCHED
---help---
Say Y here if you want to use the True Link Equalizer (TLE) packet
scheduling algorithm for some of your network devices or as a leaf
discipline for the CBQ 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
details).
To compile this code as a module, choose M here: the
module will be called sch_teql.
config NET_SCH_TBF
tristate "TBF queue"
depends on NET_SCHED
help
Say Y here if you want to use the Simple Token Bucket Filter (TBF)
packet scheduling algorithm for some of your network devices or as a
leaf discipline for the CBQ scheduling algorithm (see the top of
<file:net/sched/sch_tbf.c> for a description of the TBF algorithm).
To compile this code as a module, choose M here: the
module will be called sch_tbf.
config NET_SCH_GRED
tristate "GRED queue"
depends on NET_SCHED
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 "Diffserv field marker"
depends on NET_SCHED
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"
depends on NET_SCHED
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_INGRESS
tristate "Ingress Qdisc"
depends on NET_SCHED
help
If you say Y here, you will be able to police incoming bandwidth
and drop packets when this bandwidth exceeds your desired rate.
If unsure, say Y.
To compile this code as a module, choose M here: the
module will be called sch_ingress.
config NET_QOS
bool "QoS support"
depends on NET_SCHED
---help---
Say Y here if you want to include Quality Of Service scheduling
features, which means that you will be able to request certain
rate-of-flow limits for your network devices.
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 "Packet classifier
API" and to some classifiers below. Documentation and software is at
<http://diffserv.sourceforge.net/>.
Note that the answer to this question won't directly affect the
kernel: saying N will just cause the configurator to skip all
the questions about QoS support.
config NET_ESTIMATOR
bool "Rate estimator"
depends on NET_QOS
help
In order for Quality of Service scheduling to work, the current
rate-of-flow for a network device has to be estimated; if you say Y
here, the kernel will do just that.
config NET_CLS
bool "Packet classifier API"
depends on NET_SCHED
---help---
The CBQ scheduling algorithm requires that network packets which are
scheduled to be sent out over a network device be classified
according to some criterion. If you say Y here, you will get a
choice of several different packet classifiers with the following
questions.
This will enable you to use Differentiated Services (diffserv) and
Resource Reservation Protocol (RSVP) on your Linux router.
Documentation and software is at
<http://diffserv.sourceforge.net/>.
config NET_CLS_BASIC
tristate "Basic classifier"
depends on NET_CLS
---help---
Say Y here if you want to be able to classify packets using
only extended matches and actions.
To compile this code as a module, choose M here: the
module will be called cls_basic.
config NET_CLS_TCINDEX
tristate "TC index classifier"
depends on NET_CLS
help
If you say Y here, you will be able to classify outgoing packets
according to the tc_index field of the skb. You will want this
feature if you want to implement Differentiated Services using
sch_dsmark. If unsure, say Y.
To compile this code as a module, choose M here: the
module will be called cls_tcindex.
config NET_CLS_ROUTE4
tristate "Routing table based classifier"
depends on NET_CLS
select NET_CLS_ROUTE
help
If you say Y here, you will be able to classify outgoing packets
according to the route table entry they matched. If unsure, say Y.
To compile this code as a module, choose M here: the
module will be called cls_route.
config NET_CLS_ROUTE
bool
default n
config NET_CLS_FW
tristate "Firewall based classifier"
depends on NET_CLS
help
If you say Y here, you will be able to classify outgoing packets
according to firewall criteria you specified.
To compile this code as a module, choose M here: the
module will be called cls_fw.
config NET_CLS_U32
tristate "U32 classifier"
depends on NET_CLS
help
If you say Y here, you will be able to classify outgoing packets
according to their destination address. If unsure, say Y.
To compile this code as a module, choose M here: the
module will be called cls_u32.
config CLS_U32_PERF
bool "U32 classifier performance counters"
depends on NET_CLS_U32
help
gathers stats that could be used to tune u32 classifier performance.
Requires a new iproute2
You MUST NOT turn this on if you dont have an update iproute2.
config NET_CLS_IND
bool "classify input device (slows things u32/fw) "
depends on NET_CLS_U32 || NET_CLS_FW
help
This option will be killed eventually when a
metadata action appears because it slows things a little
Available only for u32 and fw classifiers.
Requires a new iproute2
You MUST NOT turn this on if you dont have an update iproute2.
config CLS_U32_MARK
bool "Use nfmark as a key in U32 classifier"
depends on NET_CLS_U32 && NETFILTER
help
This allows you to match mark in a u32 filter.
Example:
tc filter add dev eth0 protocol ip parent 1:0 prio 5 u32 \
match mark 0x0090 0xffff \
match ip dst 4.4.4.4 \
flowid 1:90
You must use a new iproute2 to use this feature.
config NET_CLS_RSVP
tristate "Special RSVP classifier"
depends on NET_CLS && NET_QOS
---help---
The Resource Reservation Protocol (RSVP) permits end systems to
request a minimum and maximum data flow rate for a connection; this
is important for real time data such as streaming sound or video.
Say Y here if you want to be able to classify outgoing packets based
on their RSVP requests.
To compile this code as a module, choose M here: the
module will be called cls_rsvp.
config NET_CLS_RSVP6
tristate "Special RSVP classifier for IPv6"
depends on NET_CLS && NET_QOS
---help---
The Resource Reservation Protocol (RSVP) permits end systems to
request a minimum and maximum data flow rate for a connection; this
is important for real time data such as streaming sound or video.
Say Y here if you want to be able to classify outgoing packets based
on their RSVP requests and you are using the new Internet Protocol
IPv6 as opposed to the older and more common IPv4.
To compile this code as a module, choose M here: the
module will be called cls_rsvp6.
config NET_EMATCH
bool "Extended Matches"
depends on NET_CLS
---help---
Say Y here if you want to use extended matches on top of classifiers
and select the extended matches below.
Extended matches are small classification helpers not worth writing
a separate classifier.
You must have a recent version of the iproute2 tools in order to use
extended matches.
config NET_EMATCH_STACK
int "Stack size"
depends on NET_EMATCH
default "32"
---help---
Size of the local stack variable used while evaluating the tree of
ematches. Limits the depth of the tree, i.e. the number of
encapsulated precedences. Every level requires 4 bytes of additional
stack space.
config NET_EMATCH_CMP
tristate "Simple packet data comparison"
depends on NET_EMATCH
---help---
Say Y here if you want to be able to classify packets based on
simple packet data comparisons for 8, 16, and 32bit values.
To compile this code as a module, choose M here: the
module will be called em_cmp.
config NET_EMATCH_NBYTE
tristate "Multi byte comparison"
depends on NET_EMATCH
---help---
Say Y here if you want to be able to classify packets based on
multiple byte comparisons mainly useful for IPv6 address comparisons.
To compile this code as a module, choose M here: the
module will be called em_nbyte.
config NET_EMATCH_U32
tristate "U32 hashing key"
depends on NET_EMATCH
---help---
Say Y here if you want to be able to classify packets using
the famous u32 key in combination with logic relations.
To compile this code as a module, choose M here: the
module will be called em_u32.
config NET_EMATCH_META
tristate "Metadata"
depends on NET_EMATCH
---help---
Say Y here if you want to be ablt to classify packets based on
metadata such as load average, netfilter attributes, socket
attributes and routing decisions.
To compile this code as a module, choose M here: the
module will be called em_meta.
config NET_EMATCH_TEXT
tristate "Textsearch"
depends on NET_EMATCH
select TEXTSEARCH
select TEXTSEARCH_KMP
select TEXTSEARCH_BM
select TEXTSEARCH_FSM
---help---
Say Y here if you want to be ablt to classify packets based on
textsearch comparisons.
To compile this code as a module, choose M here: the
module will be called em_text.
config NET_CLS_ACT
bool "Packet ACTION"
depends on EXPERIMENTAL && NET_CLS && NET_QOS
---help---
This option requires you have a new iproute2. It enables
tc extensions which can be used with tc classifiers.
You MUST NOT turn this on if you dont have an update iproute2.
config NET_ACT_POLICE
tristate "Policing Actions"
depends on NET_CLS_ACT
---help---
If you are using a newer iproute2 select this one, otherwise use one
below to select a policer.
You MUST NOT turn this on if you dont have an update iproute2.
config NET_ACT_GACT
tristate "generic Actions"
depends on NET_CLS_ACT
---help---
You must have new iproute2 to use this feature.
This adds simple filtering actions like drop, accept etc.
config GACT_PROB
bool "generic Actions probability"
depends on NET_ACT_GACT
---help---
Allows generic actions to be randomly or deterministically used.
config NET_ACT_MIRRED
tristate "Packet In/Egress redirecton/mirror Actions"
depends on NET_CLS_ACT
---help---
requires new iproute2
This allows packets to be mirrored or redirected to netdevices
config NET_ACT_IPT
tristate "iptables Actions"
depends on NET_CLS_ACT && NETFILTER && IP_NF_IPTABLES
---help---
requires new iproute2
This allows iptables targets to be used by tc filters
config NET_ACT_PEDIT
tristate "Generic Packet Editor Actions"
depends on NET_CLS_ACT
---help---
requires new iproute2
This allows for packets to be generically edited
config NET_CLS_POLICE
bool "Traffic policing (needed for in/egress)"
depends on NET_CLS && NET_QOS && NET_CLS_ACT!=y
help
Say Y to support traffic policing (bandwidth limits). Needed for
ingress and egress rate limiting.
config NET_ACT_SIMP
tristate "Simple action"
depends on NET_CLS_ACT
---help---
You must have new iproute2 to use this feature.
This adds a very simple action for demonstration purposes
The idea is to give action authors a basic example to look at.
All this action will do is print on the console the configured
policy string followed by _ then packet count.
