1menu "DCCP CCIDs Configuration (EXPERIMENTAL)" 2 depends on IP_DCCP && EXPERIMENTAL 3 4config IP_DCCP_CCID2 5 tristate "CCID2 (TCP-Like) (EXPERIMENTAL)" 6 depends on IP_DCCP 7 def_tristate IP_DCCP 8 select IP_DCCP_ACKVEC 9 ---help--- 10 CCID 2, TCP-like Congestion Control, denotes Additive Increase, 11 Multiplicative Decrease (AIMD) congestion control with behavior 12 modelled directly on TCP, including congestion window, slow start, 13 timeouts, and so forth [RFC 2581]. CCID 2 achieves maximum 14 bandwidth over the long term, consistent with the use of end-to-end 15 congestion control, but halves its congestion window in response to 16 each congestion event. This leads to the abrupt rate changes 17 typical of TCP. Applications should use CCID 2 if they prefer 18 maximum bandwidth utilization to steadiness of rate. This is often 19 the case for applications that are not playing their data directly 20 to the user. For example, a hypothetical application that 21 transferred files over DCCP, using application-level retransmissions 22 for lost packets, would prefer CCID 2 to CCID 3. On-line games may 23 also prefer CCID 2. 24 25 CCID 2 is further described in: 26 http://www.icir.org/kohler/dccp/draft-ietf-dccp-ccid2-10.txt 27 28 This text was extracted from: 29 http://www.icir.org/kohler/dccp/draft-ietf-dccp-spec-13.txt 30 31 If in doubt, say M. 32 33config IP_DCCP_CCID3 34 tristate "CCID3 (TCP-Friendly) (EXPERIMENTAL)" 35 depends on IP_DCCP 36 def_tristate IP_DCCP 37 ---help--- 38 CCID 3 denotes TCP-Friendly Rate Control (TFRC), an equation-based 39 rate-controlled congestion control mechanism. TFRC is designed to 40 be reasonably fair when competing for bandwidth with TCP-like flows, 41 where a flow is "reasonably fair" if its sending rate is generally 42 within a factor of two of the sending rate of a TCP flow under the 43 same conditions. However, TFRC has a much lower variation of 44 throughput over time compared with TCP, which makes CCID 3 more 45 suitable than CCID 2 for applications such streaming media where a 46 relatively smooth sending rate is of importance. 47 48 CCID 3 is further described in: 49 50 http://www.icir.org/kohler/dccp/draft-ietf-dccp-ccid3-11.txt. 51 52 The TFRC congestion control algorithms were initially described in 53 RFC 3448. 54 55 This text was extracted from: 56 http://www.icir.org/kohler/dccp/draft-ietf-dccp-spec-13.txt 57 58 If in doubt, say M. 59 60config IP_DCCP_TFRC_LIB 61 depends on IP_DCCP_CCID3 62 def_tristate IP_DCCP_CCID3 63 64endmenu 65