netdev - [PATCH iproute2] document initcwnd

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Date:	Wed, 05 May 2010 21:37:40 -0400
From:	Brian Bloniarz <bmb@...enacr.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	dormando <dormando@...ia.net>, netdev@...r.kernel.org,
	Rick Jones <rick.jones2@...com>, shemminger@...l.org
Subject: [PATCH iproute2] document initcwnd

Stephen Hemminger wrote:
> On Wed, 05 May 2010 16:56:34 -0400
> Brian Bloniarz <bmb@...enacr.com> wrote:
> 
>> dormando wrote:
>>>> This sounds like TCP slow start.
>>>>
>>>> http://en.wikipedia.org/wiki/Slow-start
>>>>
>>>> As far as tunables you might want to play with the initcwnd route
>>>> flag (see "ip route help")
>>> Ah, yes, initcwnd was it. I'm well aware of TCP Congestion control / slow
>>> start / etc. However I couldn't find the damn tunable for it :)
>> Documenting the flag in ip(8) might increase its visibility
>> a little. I don't see it documented in the iproute2 git head,
>> though it shows up on http://linux.die.net/man/8/ip somehow.
>>
>> Stephen, do you know why that is?
> 
> No one sent me an official patch to change it?

Mention initcwnd in ip(8). Text taken from doc/ip-cref.tex.

Signed-off-by: Brian Bloniarz <bmb@...enacr.com>

diff --git a/man/man8/ip.8 b/man/man8/ip.8
index a5d2915..777a0a7 100644
--- a/man/man8/ip.8
+++ b/man/man8/ip.8
@@ -211,7 +211,9 @@ replace " | " monitor " } "
 .B  realms
 .IR REALM " ] [ "
 .B  rto_min
-.IR TIME " ]"
+.IR TIME " ] [ "
+.B  initcwnd
+.IR NUMBER " ]"
 
 .ti -8
 .IR TYPE " := [ "
@@ -1561,6 +1563,13 @@ the clamp for congestion window.  It is ignored if the
 flag is not used.
 
 .TP
+.BI initcwnd " NUMBER " "(2.5.70+ only)"
+Initial congestion window size for connections to this destination.
+Actual window size is this value multiplied by the MSS
+(``Maximal Segment Size'') for same connection. The default is
+zero, meaning to use the values specified in RFC2414.
+
+.TP
 .BI advmss " NUMBER " "(2.3.15+ only)"
 the MSS ('Maximal Segment Size') to advertise to these
 destinations when establishing TCP connections.  If it is not given,
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