[openbsd] JoBS (Joint Buffer Management and Scheduling)

[irix <irix@ukr.net>]

Hello Openbsd,

  В  старом  altqd,  есть такой алгоритм JoBS (Joint Buffer Management
  and Scheduling).
  Полистал  ман  с его описанием, понравился. Как вы считаете, нужен ли
  он  в  новом  pf/altq  ?   И  что вы думаете непосредственно про сам
  алгоритм ?

  Ниже привожу вырезку из мана.

     JoBS (Joint Buffer Management and Scheduling) is a queuing discipline
     that can enforce any feasible mix of absolute and proportional guarantees
     on packet losses, packet delays, and throughput, for classes of traffic,
     on a per-hop basis.  No admission control is performed, thus if the set
     of service guarantees becomes infeasible, some service guarantees may be
     relaxed.

           interface  if_name [bandwidth bps] [qlimit count] [separate]
                      [tbrsize bytes] [sched_type]

           if_name   specifies the name of a network interface (e.g., fxp0).

           bandwidth
                     specifies the interface bandwidth in bits per second.

           qlimit    specifies the maximum queue size in number of packets.

           separate  specifies that classes have independent buffers.  The
                     default is to have a shared buffer for all classes.  If
                     this option is specified, qlimit applies to each indepen-
                     dent buffer.

           tbrsize   specifies the bucket size of a token bucket regulator in
                     bytes.

           sched_type
                     must be jobs for JoBS.

           class  sched_type if_name class_name parent_name [priority pri]
                  [default] [adc microsecs] [alc fraction] [arc bps] [rdc
                  prop] [rlc prop]

           sched_type
                     must be jobs for a JoBS class.

           if_name   Interface name.  Must correspond to name in interface
                     specification.

           class_name
                     Arbitrary name for this class.  Must be unique for this
                     interface.

           parent_name
                     Parent class must be NULL for JoBS.

           priority  Priority index used for proportional differentiation.
                     Max value is 15 and Min value is 0.  Default is 0.  Pri-
                     ority must be unique for the interface.

           default   Specify the default class.  When this keyword is present,
                     all packets that do not match some classification crite-
                     ria are assigned to this class.  Must be exactly one
                     class on each interface defined as the default class.

           adc       Specifies an upper bound on delays for that class (in
                     microseconds).  A value of -1 will indicate the absence
                     of delay bound.  By default, no delay bound is offered.

           alc       Specifies a upper bound on loss rate for that class (in
                     fraction of 1, for instance a 1% loss rate bound will be
                     expressed as 0.01).  A value of -1 will indicate the
                     absence of loss rate bound.  By default, no loss rate
                     bound is offered.

           arc       Specifies a lower bound on the throughput received by
                     that class (in bits per second).  A value of -1 will
                     indicate the absence of throughput bound.  By default, no
                     throughput bound is offered.

           rdc       Specifies a proportional delay differentiation factor
                     between that class and the class with the successive pri-
                     ority index.  For instance, for priority 1, an rdc of 2
                     specifies that the delays of packets marked as class 2
                     will roughly be twice the delays of packets marked as
                     class 1.  A value of -1 indicates the absence of propor-
                     tional differentiation on that class.  Note that class N
                     if N is the maximum priority should have a dummy coeffi-
                     cient different from -1 if proportional delay differenti-
                     ation is desired on Class N.  By default, no proportional
                     delay differentiation is offered.

           rlc       Specifies a proportional loss differentiation factor
                     between that class and the class with the successive pri-
                     ority index.  For instance, for priority 1, an rlc of 2
                     specifies that the loss rate of packets marked as class 2
                     will roughly be twice the loss rate of packets marked as
                     class 1.  A value of -1 indicates the absence of propor-
                     tional differentiation on that class.  Note that class N
                     if N is the maximum priority should have a dummy coeffi-
                     cient different from -1 if proportional loss differentia-
                     tion is desired on Class N.  By default, no proportional
                     loss differentiation is offered.



-- 
Best regards,
 irix                          mailto:irix@ukr.net


-- 
To unsubscribe send an e-mail to openbsd+unsubscribe@uaoug.org.ua
For retrieval in messages archive http://www.uaoug.org.ua/archive