Re: [PATCH] tcp: set congestion default through Kconfig
On Tuesday 19 September 2006 06:41, Stephen Hemminger wrote: Bert's attempt was noble It showed your desire for the truth A simple path exists I guess most people won't have a clue on what to configure here (especially with such sparse help text, but even with more it would be hard). And you might end up with some weird error reports if someone manages to configure one of the more broken algorithms. How about a single auto selection heuristic: e.g. check the handshake latencies and if they are too long switch from reno to the newer one deemed most stable? -Andi - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
* Andi Kleen | 2006-09-19 12:03:51 [+0200]: How about a single auto selection heuristic: e.g. check the handshake latencies and if they are too long switch from reno to the newer one deemed most stable? Thats absolute no practicable solution to discover the 'right' algorithm. The latenzy is only one piece in the puzzle the determine the optimal congestion control algorithm and completely inadequate. You must also discover the bandwith and other factors to make a decision. And this is nearly impossible and object of actual research. Through due to the heterogeneity of the net it is often not possible the select the right one. To select a general purpose algorithm here is the better choice. BTW: BIC is sometimes to aggressive in comparison to standard tcp behaviour (e.g. in short RTT environments) - this is an known issue. Why not cubic as the default one? -Andi HGN -- You need the computing power of a Pentium, 16 MB RAM and 1 GB Harddisk to run Win95. It took the computing power of 3 Commodore 64 to fly to the Moon. Something is wrong here, and it wasn't the Apollo. - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
On Tue, 19 Sep 2006 12:03:51 +0200 Andi Kleen [EMAIL PROTECTED] wrote: On Tuesday 19 September 2006 06:41, Stephen Hemminger wrote: Bert's attempt was noble It showed your desire for the truth A simple path exists I guess most people won't have a clue on what to configure here (especially with such sparse help text, but even with more it would be hard). And you might end up with some weird error reports if someone manages to configure one of the more broken algorithms. I tried to only put known stable ones in the choices list. - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
From: Hagen Paul Pfeifer [EMAIL PROTECTED] Date: Tue, 19 Sep 2006 14:35:35 +0200 BTW: BIC is sometimes to aggressive in comparison to standard tcp behaviour (e.g. in short RTT environments) - this is an known issue. Why not cubic as the default one? We may change over to CUBIC as the default in 2.6.19, I wanted CUBIC to sit around in the tree for a while in case some major issues came up first. - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
On Tue, 19 Sep 2006 09:10:37 -0700 (PDT) David Miller [EMAIL PROTECTED] wrote: From: Hagen Paul Pfeifer [EMAIL PROTECTED] Date: Tue, 19 Sep 2006 14:35:35 +0200 BTW: BIC is sometimes to aggressive in comparison to standard tcp behaviour (e.g. in short RTT environments) - this is an known issue. Why not cubic as the default one? We may change over to CUBIC as the default in 2.6.19, I wanted CUBIC to sit around in the tree for a while in case some major issues came up first. I was going to do this for 2.6.19 as well, but wanted more discussion and also do it as a separate step from the config changes. -- Stephen Hemminger [EMAIL PROTECTED] - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
Actually, I take that back: net/ipv4/sysctl_net_ipv4.c: In function $,1rx(Btcp_congestion_default$,1ry(B: net/ipv4/sysctl_net_ipv4.c:134: error: syntax error before $,1rx(B}$,1ry(B token net/ipv4/sysctl_net_ipv4.c: At top level: net/ipv4/sysctl_net_ipv4.c:136: warning: initialization from incompatible pointer type I'll fix this up, but I'm seeing a very disturbing pattern lately of very clueful people posting patches without typing make. Is this too much to ask these days? This costs me an enormous amount of time, to review someone's patch and verify it's logical correctness, only to check it in and find out that it doesn't even build. That, frankly, is unacceptable. - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
From: Stephen Hemminger [EMAIL PROTECTED] Date: Mon, 18 Sep 2006 21:41:04 -0700 Bert's attempt was noble It showed your desire for the truth A simple path exists Signed-off-by: Stephen Hemminger [EMAIL PROTECTED] Looks good, applied. - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig
Ok, I really give up, after adding the missing semicolon I now get this: net/ipv4/sysctl_net_ipv4.c:136: warning: initialization from incompatible pointer type This is getting rediculious. Folks, don't post patches which are not request for comments explicitly in the subject line without testing the build, ever! - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH] tcp: set congestion default through Kconfig (v2)
Bert's attempt was noble
It showed your desire for the truth
A simple path existed
Signed-off-by: Stephen Hemminger [EMAIL PROTECTED]
---
net/ipv4/Kconfig | 39 +--
net/ipv4/sysctl_net_ipv4.c |6 ++
net/ipv4/tcp_cong.c|2 +-
3 files changed, 44 insertions(+), 3 deletions(-)
--- net-2.6.19.orig/net/ipv4/Kconfig2006-09-19 13:11:09.0 -0700
+++ net-2.6.19/net/ipv4/Kconfig 2006-09-19 13:20:45.0 -0700
@@ -573,12 +573,47 @@
loss packets.
See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
+choice
+ prompt Default TCP congestion control
+ default DEFAULT_BIC
+ help
+ 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
+
+ config DEFAULT_HTCP
+ bool Htcp if TCP_CONG_HTCP=y
+
+ config DEFAULT_VEGAS
+ bool Vegas if TCP_CONG_VEGAS=y
+
+ config DEFAULT_WESTWOOD
+ bool Westwood if TCP_CONG_WESTWOOD=y
+
+ config DEFAULT_RENO
+ bool Reno
+
+endchoice
+
endmenu
-config TCP_CONG_BIC
- tristate
+config DEFAULT_BIC
depends on !TCP_CONG_ADVANCED
default y
+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
+ default westwood if DEFAULT_WESTWOOD
+ default reno if DEFAULT_RENO
+
source net/ipv4/ipvs/Kconfig
--- net-2.6.19.orig/net/ipv4/sysctl_net_ipv4.c 2006-09-19 13:11:09.0
-0700
+++ net-2.6.19/net/ipv4/sysctl_net_ipv4.c 2006-09-19 13:37:04.0
-0700
@@ -129,6 +129,12 @@
return ret;
}
+static int __init tcp_congestion_default(void)
+{
+ return tcp_set_default_congestion_control(CONFIG_DEFAULT_TCP_CONG);
+}
+
+late_initcall(tcp_congestion_default);
ctl_table ipv4_table[] = {
{
--- net-2.6.19.orig/net/ipv4/tcp_cong.c 2006-09-19 13:11:09.0 -0700
+++ net-2.6.19/net/ipv4/tcp_cong.c 2006-09-19 13:20:45.0 -0700
@@ -48,7 +48,7 @@
printk(KERN_NOTICE TCP %s already registered\n, ca-name);
ret = -EEXIST;
} else {
- list_add_rcu(ca-list, tcp_cong_list);
+ list_add_tail_rcu(ca-list, tcp_cong_list);
printk(KERN_INFO TCP %s registered\n, ca-name);
}
spin_unlock(tcp_cong_list_lock);
-
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Re: [PATCH] tcp: set congestion default through Kconfig (v2)
From: Stephen Hemminger [EMAIL PROTECTED] Date: Tue, 19 Sep 2006 13:41:32 -0700 Bert's attempt was noble It showed your desire for the truth A simple path existed Signed-off-by: Stephen Hemminger [EMAIL PROTECTED] Applied, but... net/ipv4/Kconfig:607:warning: defaults for choice values not supported Hmmm... - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH] tcp: set congestion default through Kconfig (v2)
On Tue, Sep 19, 2006 at 02:20:07PM -0700, David Miller wrote: Bert's attempt was noble It showed your desire for the truth It was also crap :-) Applied, but... net/ipv4/Kconfig:607:warning: defaults for choice values not supported It does appear to do the right thing in all cases I throw against it, but this warning is sure to generate noise. It probably means CONFIG_BIC is both available in the menu, and set as a separate option, and that this does not set the menu to CONFIG_BIC. This is not a big deal however as the menu is not shown at all whenever line 607 applies. -- http://www.PowerDNS.com Open source, database driven DNS Software http://netherlabs.nl Open and Closed source services - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH] tcp: set congestion default through Kconfig
Bert's attempt was noble
It showed your desire for the truth
A simple path exists
Signed-off-by: Stephen Hemminger [EMAIL PROTECTED]
---
net/ipv4/Kconfig | 39 +--
net/ipv4/sysctl_net_ipv4.c |7 +++
net/ipv4/tcp_cong.c|2 +-
3 files changed, 45 insertions(+), 3 deletions(-)
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 90f9136..e922c3a 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -573,12 +573,47 @@ config TCP_CONG_VENO
loss packets.
See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
+choice
+ prompt Default TCP congestion control
+ default DEFAULT_BIC
+ help
+ 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
+
+ config DEFAULT_HTCP
+ bool Htcp if TCP_CONG_HTCP=y
+
+ config DEFAULT_VEGAS
+ bool Vegas if TCP_CONG_VEGAS=y
+
+ config DEFAULT_WESTWOOD
+ bool Westwood if TCP_CONG_WESTWOOD=y
+
+ config DEFAULT_RENO
+ bool Reno
+
+endchoice
+
endmenu
-config TCP_CONG_BIC
- tristate
+config DEFAULT_BIC
depends on !TCP_CONG_ADVANCED
default y
+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
+ default westwood if DEFAULT_WESTWOOD
+ default reno if DEFAULT_RENO
+
source net/ipv4/ipvs/Kconfig
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 19b2071..52b6481 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -129,6 +129,13 @@ static int sysctl_tcp_congestion_control
return ret;
}
+static __init void tcp_congestion_default(void)
+{
+ tcp_set_default_congestion_control(CONFIG_DEFAULT_TCP_CONG)
+}
+
+late_initcall(tcp_congestion_default);
+
ctl_table ipv4_table[] = {
{
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 7ff2e42..af0aca1 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -48,7 +48,7 @@ int tcp_register_congestion_control(stru
printk(KERN_NOTICE TCP %s already registered\n, ca-name);
ret = -EEXIST;
} else {
- list_add_rcu(ca-list, tcp_cong_list);
+ list_add_tail_rcu(ca-list, tcp_cong_list);
printk(KERN_INFO TCP %s registered\n, ca-name);
}
spin_unlock(tcp_cong_list_lock);
--
1.4.1
-
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Re: [PATCH] tcp: set congestion default through Kconfig
Signed-off-by: Stephen Hemminger [EMAIL PROTECTED] --- net/ipv4/Kconfig | 39 +-- net/ipv4/sysctl_net_ipv4.c |7 +++ net/ipv4/tcp_cong.c|2 +- 3 files changed, 45 insertions(+), 3 deletions(-) Nice solution. Signed-off-by: Ian McDonald [EMAIL PROTECTED] -- Ian McDonald Web: http://wand.net.nz/~iam4 Blog: http://imcdnzl.blogspot.com WAND Network Research Group Department of Computer Science University of Waikato New Zealand - To unsubscribe from this list: send the line unsubscribe netdev in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
