tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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