1 menu "DCCP CCIDs Configuration (EXPERIMENTAL)"
2 depends on IP_DCCP && EXPERIMENTAL
5 tristate "CCID2 (TCP) (EXPERIMENTAL)"
9 CCID 2, TCP-like Congestion Control, denotes Additive Increase,
10 Multiplicative Decrease (AIMD) congestion control with behavior
11 modelled directly on TCP, including congestion window, slow start,
12 timeouts, and so forth [RFC 2581]. CCID 2 achieves maximum
13 bandwidth over the long term, consistent with the use of end-to-end
14 congestion control, but halves its congestion window in response to
15 each congestion event. This leads to the abrupt rate changes
16 typical of TCP. Applications should use CCID 2 if they prefer
17 maximum bandwidth utilization to steadiness of rate. This is often
18 the case for applications that are not playing their data directly
19 to the user. For example, a hypothetical application that
20 transferred files over DCCP, using application-level retransmissions
21 for lost packets, would prefer CCID 2 to CCID 3. On-line games may
24 CCID 2 is further described in:
25 http://www.icir.org/kohler/dccp/draft-ietf-dccp-ccid2-10.txt
27 This text was extracted from:
28 http://www.icir.org/kohler/dccp/draft-ietf-dccp-spec-13.txt
33 tristate "CCID3 (TFRC) (EXPERIMENTAL)"
36 CCID 3 denotes TCP-Friendly Rate Control (TFRC), an equation-based
37 rate-controlled congestion control mechanism. TFRC is designed to
38 be reasonably fair when competing for bandwidth with TCP-like flows,
39 where a flow is "reasonably fair" if its sending rate is generally
40 within a factor of two of the sending rate of a TCP flow under the
41 same conditions. However, TFRC has a much lower variation of
42 throughput over time compared with TCP, which makes CCID 3 more
43 suitable than CCID 2 for applications such streaming media where a
44 relatively smooth sending rate is of importance.
46 CCID 3 is further described in:
48 http://www.icir.org/kohler/dccp/draft-ietf-dccp-ccid3-11.txt.
50 The TFRC congestion control algorithms were initially described in
53 This text was extracted from:
54 http://www.icir.org/kohler/dccp/draft-ietf-dccp-spec-13.txt
58 config IP_DCCP_TFRC_LIB
59 depends on IP_DCCP_CCID3
60 def_tristate IP_DCCP_CCID3