tc-hfsc(8) - phpMan

HFSC(8)                                       Linux                                       HFSC(8)

NAME
       HFSC - Hierarchical Fair Service Curve's control under linux

SYNOPSIS
       tc qdisc add ... hfsc [ default CLASSID ]

       tc class add ... hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ]

       rt : realtime service curve
       ls : linkshare service curve
       sc : rt+ls service curve
       ul : upperlimit service curve

       o at least one of rt, ls or sc must be specified
       o ul can only be specified with ls or sc

       SC := [ [ m1 BPS ] d SEC ] m2 BPS
              m1 : slope of the first segment
              d  : x-coordinate of intersection
              m2 : slope of the second segment

       SC := [ [ umax BYTE ] dmax SEC ] rate BPS
              umax : maximum unit of work
              dmax : maximum delay
              rate : rate

       For description of BYTE, BPS and SEC - please see UNITS section of tc(8).

DESCRIPTION (qdisc)
       HFSC  qdisc has only one optional parameter - default. CLASSID specifies the minor part of
       the default classid, where packets not classified by other means (e.g. u32  filter,  CLAS-
       SIFY target of iptables) will be enqueued. If default is not specified, unclassified pack-
       ets will be dropped.

DESCRIPTION (class)
       HFSC class is used to create a class hierarchy for HFSC scheduler. For explanation of  the
       algorithm,  and  the  meaning  behind  rt,  ls, sc and ul service curves - please refer to
       tc-hfsc(7).

       As you can see in SYNOPSIS, service curve (SC) can be specified in  two  ways.  Either  as
       maximum delay for certain amount of work, or as a bandwidth assigned for certain amount of
       time. Obviously, m1 is simply umax/dmax.

       Both m2 and rate are mandatory. If you omit other parameters, you will specify linear ser-
       vice curve.

SEE ALSO
       tc(8), tc-hfsc(7), tc-stab(8)

       Please direct bugreports and patches to: <netdev AT vger.org>

AUTHOR
       Manpage created by Michal Soltys (soltys AT ziu.info)

iproute2                                 31 October 2011                                  HFSC(8)

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