4dbc242ed3
Thanks to Wei and Arnaldo for pointing out the correct new reference for CCID-3. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
3 KiB
Text
86 lines
3 KiB
Text
menu "DCCP CCIDs Configuration (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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config IP_DCCP_CCID2_DEBUG
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bool "CCID-2 debugging messages"
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---help---
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Enable CCID-2 specific debugging messages.
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The debugging output can additionally be toggled by setting the
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ccid2_debug parameter to 0 or 1.
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If in doubt, say N.
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config IP_DCCP_CCID3
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bool "CCID-3 (TCP-Friendly) (EXPERIMENTAL)"
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def_bool y if (IP_DCCP = y || IP_DCCP = m)
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---help---
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CCID-3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
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rate-controlled congestion control mechanism. TFRC is designed to
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be reasonably fair when competing for bandwidth with TCP-like flows,
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where a flow is "reasonably fair" if its sending rate is generally
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within a factor of two of the sending rate of a TCP flow under the
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same conditions. However, TFRC has a much lower variation of
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throughput over time compared with TCP, which makes CCID-3 more
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suitable than CCID-2 for applications such streaming media where a
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relatively smooth sending rate is of importance.
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CCID-3 is further described in RFC 4342,
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http://www.ietf.org/rfc/rfc4342.txt
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The TFRC congestion control algorithms were initially described in
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RFC 5348.
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This text was extracted from RFC 4340 (sec. 10.2),
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http://www.ietf.org/rfc/rfc4340.txt
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If in doubt, say N.
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config IP_DCCP_CCID3_DEBUG
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bool "CCID-3 debugging messages"
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depends on IP_DCCP_CCID3
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---help---
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Enable CCID-3 specific debugging messages.
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The debugging output can additionally be toggled by setting the
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ccid3_debug parameter to 0 or 1.
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If in doubt, say N.
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config IP_DCCP_CCID3_RTO
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int "Use higher bound for nofeedback timer"
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default 100
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depends on IP_DCCP_CCID3 && EXPERIMENTAL
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---help---
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Use higher lower bound for nofeedback timer expiration.
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The TFRC nofeedback timer normally expires after the maximum of 4
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RTTs and twice the current send interval (RFC 3448, 4.3). On LANs
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with a small RTT this can mean a high processing load and reduced
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performance, since then the nofeedback timer is triggered very
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frequently.
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This option enables to set a higher lower bound for the nofeedback
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value. Values in units of milliseconds can be set here.
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A value of 0 disables this feature by enforcing the value specified
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in RFC 3448. The following values have been suggested as bounds for
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experimental use:
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* 16-20ms to match the typical multimedia inter-frame interval
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* 100ms as a reasonable compromise [default]
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* 1000ms corresponds to the lower TCP RTO bound (RFC 2988, 2.4)
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The default of 100ms is a compromise between a large value for
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efficient DCCP implementations, and a small value to avoid disrupting
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the network in times of congestion.
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The purpose of the nofeedback timer is to slow DCCP down when there
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is serious network congestion: experimenting with larger values should
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therefore not be performed on WANs.
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config IP_DCCP_TFRC_LIB
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def_bool y if IP_DCCP_CCID3
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config IP_DCCP_TFRC_DEBUG
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def_bool y if IP_DCCP_CCID3_DEBUG
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endmenu
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