Creation of Cybook 2416 (actually Gen4) repository

net/dccp/ccids/Kconfig

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+menu "DCCP CCIDs Configuration (EXPERIMENTAL)"
+	depends on IP_DCCP && EXPERIMENTAL
+
+config IP_DCCP_CCID2
+	tristate "CCID2 (TCP-Like) (EXPERIMENTAL)"
+	depends on IP_DCCP
+	def_tristate IP_DCCP
+	select IP_DCCP_ACKVEC
+	---help---
+	  CCID 2, TCP-like Congestion Control, denotes Additive Increase,
+	  Multiplicative Decrease (AIMD) congestion control with behavior
+	  modelled directly on TCP, including congestion window, slow start,
+	  timeouts, and so forth [RFC 2581].  CCID 2 achieves maximum
+	  bandwidth over the long term, consistent with the use of end-to-end
+	  congestion control, but halves its congestion window in response to
+	  each congestion event.  This leads to the abrupt rate changes
+	  typical of TCP.  Applications should use CCID 2 if they prefer
+	  maximum bandwidth utilization to steadiness of rate.  This is often
+	  the case for applications that are not playing their data directly
+	  to the user.  For example, a hypothetical application that
+	  transferred files over DCCP, using application-level retransmissions
+	  for lost packets, would prefer CCID 2 to CCID 3.  On-line games may
+	  also prefer CCID 2.
+
+	  CCID 2 is further described in RFC 4341,
+	  http://www.ietf.org/rfc/rfc4341.txt
+
+	  This text was extracted from RFC 4340 (sec. 10.1),
+	  http://www.ietf.org/rfc/rfc4340.txt
+
+	  To compile this CCID as a module, choose M here: the module will be
+	  called dccp_ccid2.
+
+	  If in doubt, say M.
+
+config IP_DCCP_CCID2_DEBUG
+	  bool "CCID2 debugging messages"
+	  depends on IP_DCCP_CCID2
+	  ---help---
+	    Enable CCID2-specific debugging messages.
+
+	    When compiling CCID2 as a module, this debugging output can
+	    additionally be toggled by setting the ccid2_debug module
+	    parameter to 0 or 1.
+
+	    If in doubt, say N.
+
+config IP_DCCP_CCID3
+	tristate "CCID3 (TCP-Friendly) (EXPERIMENTAL)"
+	depends on IP_DCCP
+	def_tristate IP_DCCP
+	---help---
+	  CCID 3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
+	  rate-controlled congestion control mechanism.  TFRC is designed to
+	  be reasonably fair when competing for bandwidth with TCP-like flows,
+	  where a flow is "reasonably fair" if its sending rate is generally
+	  within a factor of two of the sending rate of a TCP flow under the
+	  same conditions.  However, TFRC has a much lower variation of
+	  throughput over time compared with TCP, which makes CCID 3 more
+	  suitable than CCID 2 for applications such streaming media where a
+	  relatively smooth sending rate is of importance.
+
+	  CCID 3 is further described in RFC 4342,
+	  http://www.ietf.org/rfc/rfc4342.txt
+
+	  The TFRC congestion control algorithms were initially described in
+	  RFC 3448.
+
+	  This text was extracted from RFC 4340 (sec. 10.2),
+	  http://www.ietf.org/rfc/rfc4340.txt
+	  
+	  To compile this CCID as a module, choose M here: the module will be
+	  called dccp_ccid3.
+
+	  If in doubt, say M.
+
+config IP_DCCP_TFRC_LIB
+	depends on IP_DCCP_CCID3
+	def_tristate IP_DCCP_CCID3
+
+config IP_DCCP_CCID3_DEBUG
+	  bool "CCID3 debugging messages"
+	  depends on IP_DCCP_CCID3
+	  ---help---
+	    Enable CCID3-specific debugging messages.
+
+	    When compiling CCID3 as a module, this debugging output can
+	    additionally be toggled by setting the ccid3_debug module
+	    parameter to 0 or 1.
+
+	    If in doubt, say N.
+
+config IP_DCCP_CCID3_RTO
+	  int "Use higher bound for nofeedback timer"
+	  default 100
+	  depends on IP_DCCP_CCID3 && EXPERIMENTAL
+	  ---help---
+	    Use higher lower bound for nofeedback timer expiration.
+
+	    The TFRC nofeedback timer normally expires after the maximum of 4
+	    RTTs and twice the current send interval (RFC 3448, 4.3). On LANs
+	    with a small RTT this can mean a high processing load and reduced
+	    performance, since then the nofeedback timer is triggered very
+	    frequently.
+
+	    This option enables to set a higher lower bound for the nofeedback
+	    value. Values in units of milliseconds can be set here.
+
+	    A value of 0 disables this feature by enforcing the value specified
+	    in RFC 3448. The following values have been suggested as bounds for
+	    experimental use:
+	    	* 16-20ms to match the typical multimedia inter-frame interval
+	    	* 100ms as a reasonable compromise [default]
+	    	* 1000ms corresponds to the lower TCP RTO bound (RFC 2988, 2.4)
+
+	    The default of 100ms is a compromise between a large value for
+	    efficient DCCP implementations, and a small value to avoid disrupting
+	    the network in times of congestion.
+
+	    The purpose of the nofeedback timer is to slow DCCP down when there
+	    is serious network congestion: experimenting with larger values should
+	    therefore not be performed on WANs.
+
+
+endmenu