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Message-ID: <20081030083641.55e936b0@extreme>
Date: Thu, 30 Oct 2008 08:36:41 -0700
From: Stephen Hemminger <shemminger@...tta.com>
To: "Injong Rhee" <rhee@....ncsu.edu>,
David Miller <davem@...emloft.net>
Cc: <netdev@...r.kernel.org>
Subject: [PATCH] tcp: mark BIC as experimental
Change the configuration defaults to mark BIC as experimental.
BIC is too aggressive and was replaced by CUBIC. Debian was picking
BIC in their default config (should be fixed by now), but the configuration
documentation did not make it explicit that this was a bad idea.
Also update the URLs in the configuration documentation to current
locations.
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
--- a/net/ipv4/Kconfig 2008-10-29 14:58:40.000000000 -0700
+++ b/net/ipv4/Kconfig 2008-10-30 08:18:08.000000000 -0700
@@ -437,7 +437,8 @@ if TCP_CONG_ADVANCED
config TCP_CONG_BIC
tristate "Binary Increase Congestion (BIC) control"
- default m
+ depends on EXPERIMENTAL
+ default n
---help---
BIC-TCP is a sender-side only change that ensures a linear RTT
fairness under large windows while offering both scalability and
@@ -447,15 +448,24 @@ config TCP_CONG_BIC
increment ensures linear RTT fairness as well as good
scalability. Under small congestion windows, binary search
increase provides TCP friendliness.
- See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
+
+ BIC growth function is too aggressive and should not be used
+ except for testing and comparision, use CUBIC instead.
+
+ For further details see:
+ http://netsrv.csc.ncsu.edu/twiki/bin/view/Main/BIC
config TCP_CONG_CUBIC
tristate "CUBIC TCP"
default y
---help---
- This is version 2.0 of BIC-TCP which uses a cubic growth function
- among other techniques.
- See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/cubic-paper.pdf
+ CUBIC TCP is an sender-side only modification to the congestion control
+ algothrim improved versions on the growth function of BIC and has an
+ improved slow start algoritm, called HyStart.
+
+ For further details see:
+ http://netsrv.csc.ncsu.edu/twiki/bin/view/Main/BIC
+
config TCP_CONG_WESTWOOD
tristate "TCP Westwood+"
@@ -581,9 +591,6 @@ choice
Select the TCP congestion control that will be used by default
for all connections.
- config DEFAULT_BIC
- bool "Bic" if TCP_CONG_BIC=y
-
config DEFAULT_CUBIC
bool "Cubic" if TCP_CONG_CUBIC=y
@@ -610,7 +617,6 @@ config TCP_CONG_CUBIC
config DEFAULT_TCP_CONG
string
- default "bic" if DEFAULT_BIC
default "cubic" if DEFAULT_CUBIC
default "htcp" if DEFAULT_HTCP
default "vegas" if DEFAULT_VEGAS
--
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