Mention ALTQ options (from openbsd), fixes part of kern/18836.
From Jason Lingohr <jason at lucid dot net dot au> in private mail.
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.\" $NetBSD: options.4,v 1.184 2002/10/17 07:48:12 jdc Exp $
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.\" $NetBSD: options.4,v 1.185 2002/11/07 01:13:57 grant Exp $
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.\"
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.\" Copyright (c) 1996
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.\" Perry E. Metzger. All rights reserved.
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@ -1269,6 +1269,113 @@ will enable source code that is subject to export control in some countries
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and compiled kernel binary will be subject to certain restriction.
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This option assumes
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.Em IPSEC .
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.It Cd options ALTQ
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Enabled ALTQ (Alternate Queueing).
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For simple rate-limiting, use
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.Xr tbrconfig 8
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to set up the interface transmission rate.
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To use queueing disciplines, their appropriate kernel options should also
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be defined (documented below).
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Queueing disciplines are managed by
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.Xr altqd 8 .
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See
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.Xr altq 9
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for details.
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.It Cd options ALTQ_HFSC
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Include support for ALTQ-implemented HFSC (Hierarchical Fair Service Curve)
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module.
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HFSC supports both link-sharing and guaranteed real-time services.
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H-FSC employs a service curve based QoS model, and its unique feature
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is an ability to decouple delay and bandwidth allocation.
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Requires
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.Em ALTQ_RED
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to use the RED queueing discipline on HFSC classes, or
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.Em ALTQ_RIO
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to use the RIO queueing discipline on HFSC classes.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_PRIQ
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Include support for ALTQ-implemented PRIQ (Priority Queueing).
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PRIQ implements a simple priority-based queueing discipline.
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A higher priority class is always served first.
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Requires
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.Em ALTQ_RED
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to use the RED queueing discipline on HFSC classes, or
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.Em ALTQ_RIO
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to use the RIO queueing discipline on HFSC classes.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_WFQ
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Include support for ALTQ-implemented WFQ (Weighted Fair Queueing).
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WFQ implements a weighted-round robin scheduler for a set of queues.
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A weight can be assigned to each queue to give a different proportion
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of the link capacity.
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A hash function is used to map a flow to one of a set of queues.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_FIFOQ
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Include support for ALTQ-implemented FIFO queueing.
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FIFOQ is a simple drop-tail FIFO (First In, First Out) queueing discipline.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_RIO
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Include support for ALTQ-implemented RIO (RED with In/Out).
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The original RIO has 2 sets of RED parameters; one for in-profile
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packets and the other for out-of-profile packets.
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At the ingress of the network, profile meters tag packets as IN or
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OUT based on contracted profiles for customers.
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Inside the network, IN packets receive preferential treatment by
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the RIO dropper.
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ALTQ/RIO has 3 drop precedence levels defined for the Assured Forwarding
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PHB of DiffServ (RFC2597).
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_BLUE
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Include support for ALTQ-implemented Blue buffer management.
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Blue is another active buffer management mechanism.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_FLOWVALVE
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Include support for ALTQ-implemented Flowvalve.
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Flowvalve is a simple implementation of a RED penalty box that identifies
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and punishes misbehaving flows.
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This option requires
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.Em ALTQ_RED
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and assumes
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.Em ALTQ .
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.It Cd options ALTQ_CDNR
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Include support for ALTQ-implemented CDNR (diffserv traffic conditioner)
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packet marking/manipulation.
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Traffic conditioners are components to meter, mark, or drop incoming
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packets according to some rules.
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As opposed to queueing disciplines, traffic conditioners handle incoming
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packets at an input interface.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_NOPCC
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Disables use of processor cycle counter to measure time in ALTQ.
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This option should be defined for a non-Pentium i386 CPU which does not
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have TSC, SMP (per-CPU counters are not in sync), or power management
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which affects processor cycle counter.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_IPSEC
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Include support for IPSEC in IPv4 ALTQ.
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_JOBS
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Undocumented at this time.
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.It Cd options ALTQ_AFMAP
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Include support for an undocumented ALTQ feature that is used to map an IP
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flow to an ATM VC (Virtual Circuit).
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This option assumes
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.Em ALTQ .
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.It Cd options ALTQ_LOCALQ
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Include support for ALTQ-implemented local queues.
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Its practical use is undefined.
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Assumes
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.Em ALTQ .
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.It Cd options SUBNETSARELOCAL
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Sets default value for net.inet.ip.subnetsarelocal variable, which
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controls whether non-directly-connected subnets of connected networks
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