Stephen,
I've applied both of your patches
(http://marc.theaimsgroup.com/?l=linux-netdevm=115878447914612w=2
and
http://marc.theaimsgroup.com/?l=linux-netdevm=115878448125216w=2
) and tried to break them, but it now appears to do the right thing in all
cases, even when malforming the .config by hand, a 'make oldconfig' restores
sanity.
Reno is chosen if none of the non-scary congestion avoidance algorithms are
available, and the default for when they are are as you intended.
I've testbooted the resulting kernel and everything appears to work as
desired, the proper TCP gets chosen, loading other ones does not change the
default, but does make them available.
Unloading the module containing the configured policy sets the policy to
'cubic', which is probably the next entry in the policy list.
All in all, this final iteration of the congestion selection patches appears
to do the job!
Davem, I'd recommend both patches for merging.
Bert
On Wed, Sep 20, 2006 at 01:32:58PM -0700, Stephen Hemminger wrote:
Change default congestion control used from BIC to the newer CUBIC
which it the successor to BIC but has better properties over long delay links.
Signed-off-by: Stephen Hemminger [EMAIL PROTECTED]
---
net/ipv4/Kconfig | 12 ++--
1 file changed, 6 insertions(+), 6 deletions(-)
--- net-test.orig/net/ipv4/Kconfig2006-09-20 12:22:06.0 -0700
+++ net-test/net/ipv4/Kconfig 2006-09-20 13:31:21.0 -0700
@@ -454,7 +454,7 @@
modules.
Nearly all users can safely say no here, and a safe default
- selection will be made (BIC-TCP with new Reno as a fallback).
+ selection will be made (CUBIC with new Reno as a fallback).
If unsure, say N.
@@ -462,7 +462,7 @@
config TCP_CONG_BIC
tristate Binary Increase Congestion (BIC) control
- default y
+ default m
---help---
BIC-TCP is a sender-side only change that ensures a linear RTT
fairness under large windows while offering both scalability and
@@ -476,7 +476,7 @@
config TCP_CONG_CUBIC
tristate CUBIC TCP
- default m
+ default y
---help---
This is version 2.0 of BIC-TCP which uses a cubic growth function
among other techniques.
@@ -573,7 +573,7 @@
choice
prompt Default TCP congestion control
- default DEFAULT_BIC
+ default DEFAULT_CUBIC
help
Select the TCP congestion control that will be used by default
for all connections.
@@ -600,7 +600,7 @@
endif
-config TCP_CONG_BIC
+config TCP_CONG_CUBIC
tristate
depends on !TCP_CONG_ADVANCED
default y
@@ -613,7 +613,7 @@
default vegas if DEFAULT_VEGAS
default westwood if DEFAULT_WESTWOOD
default reno if DEFAULT_RENO
- default bic
+ default cubic
source net/ipv4/ipvs/Kconfig
-
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