linux-imx

#

# Traffic control configuration.

#

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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/>.

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      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.

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      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

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comment "Queueing/Scheduling"

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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.

​