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| author | Kenneth Klette Jonassen <kennetkl@ifi.uio.no> | 2015-06-10 19:08:17 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-06-11 00:09:12 -0700 |
| commit | 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e (patch) | |
| tree | 840b6f52906cd97767d668f5a14df3f5b010a7fb /net/ipv4/Kconfig | |
| parent | 7782ad8bb55c18f634a6713ec38c8f1ae86ad0b5 (diff) | |
| download | linux-2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e.tar.gz linux-2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e.tar.xz | |
tcp: add CDG congestion control
CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies
the TCP sender in order to [1]:
o Use the delay gradient as a congestion signal.
o Back off with an average probability that is independent of the RTT.
o Coexist with flows that use loss-based congestion control, i.e.,
flows that are unresponsive to the delay signal.
o Tolerate packet loss unrelated to congestion. (Disabled by default.)
Its FreeBSD implementation was presented for the ICCRG in July 2012;
slides are available at http://www.ietf.org/proceedings/84/iccrg.html
Running the experiment scenarios in [1] suggests that our implementation
achieves more goodput compared with FreeBSD 10.0 senders, although it also
causes more queueing delay for a given backoff factor.
The loss tolerance heuristic is disabled by default due to safety concerns
for its use in the Internet [2, p. 45-46].
We use a variant of the Hybrid Slow start algorithm in tcp_cubic to reduce
the probability of slow start overshoot.
[1] D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using
delay gradients." In Networking 2011, pages 328-341. Springer, 2011.
[2] K.K. Jonassen. "Implementing CAIA Delay-Gradient in Linux."
MSc thesis. Department of Informatics, University of Oslo, 2015.
Cc: Eric Dumazet <edumazet@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: David Hayes <davihay@ifi.uio.no>
Cc: Andreas Petlund <apetlund@simula.no>
Cc: Dave Taht <dave.taht@bufferbloat.net>
Cc: Nicolas Kuhn <nicolas.kuhn@telecom-bretagne.eu>
Signed-off-by: Kenneth Klette Jonassen <kennetkl@ifi.uio.no>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/Kconfig')
| -rw-r--r-- | net/ipv4/Kconfig | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index d83071dccd74..6fb3c90ad726 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -615,6 +615,22 @@ config TCP_CONG_DCTCP For further details see: http://simula.stanford.edu/~alizade/Site/DCTCP_files/dctcp-final.pdf +config TCP_CONG_CDG + tristate "CAIA Delay-Gradient (CDG)" + default n + ---help--- + CAIA Delay-Gradient (CDG) is a TCP congestion control that modifies + the TCP sender in order to: + + o Use the delay gradient as a congestion signal. + o Back off with an average probability that is independent of the RTT. + o Coexist with flows that use loss-based congestion control. + o Tolerate packet loss unrelated to congestion. + + For further details see: + D.A. Hayes and G. Armitage. "Revisiting TCP congestion control using + delay gradients." In Networking 2011. Preprint: http://goo.gl/No3vdg + choice prompt "Default TCP congestion control" default DEFAULT_CUBIC @@ -646,6 +662,9 @@ choice config DEFAULT_DCTCP bool "DCTCP" if TCP_CONG_DCTCP=y + config DEFAULT_CDG + bool "CDG" if TCP_CONG_CDG=y + config DEFAULT_RENO bool "Reno" endchoice @@ -668,6 +687,7 @@ config DEFAULT_TCP_CONG default "veno" if DEFAULT_VENO default "reno" if DEFAULT_RENO default "dctcp" if DEFAULT_DCTCP + default "cdg" if DEFAULT_CDG default "cubic" config TCP_MD5SIG |