Manual: tc-hfsc

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

       • at least one of rt, ls or sc must be specified
       • 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, CLASSIFY target of iptables) will be enqueued. If default  is
       not specified, unclassified packets 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 service curve.

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

       Please direct bugreports and patches to: 

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

iproute2					       31 October 2011						     HFSC(8)