netdev - Re: [PATCH] [TCP] Sysctl: document tcp_max

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Message-ID: <Pine.LNX.4.64.0705190954040.23269@kivilampi-30.cs.helsinki.fi>
Date:	Sat, 19 May 2007 10:01:11 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Baruch Even <baruch@...en.org>, David Miller <davem@...emloft.net>
cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] [TCP] Sysctl: document tcp_max_ssthresh (Limited
 Slow-Start)

On Fri, 18 May 2007, Baruch Even wrote:

> I'm not a native English speaker but "at most" sounds a bit awkward to
> me, maybe change it to "by no more than". But I'm sure someone can find
> a better phrasing.

Neither am I, but since nothing else seems to have came up, here is one 
with your proposal... In addition to your changes, I fixed the 
capitalization of the first sentence (which was a result of copy-paste 
from RFC's title).

[PATCH] [TCP] Sysctl: Document tcp_max_ssthresh (Limited Slow-Start)

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---
 Documentation/networking/ip-sysctl.txt |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index ce16e6a..b4d0a66 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -239,6 +239,19 @@ tcp_max_orphans - INTEGER
 	more aggressively. Let me to remind again: each orphan eats
 	up to ~64K of unswappable memory.
 
+tcp_max_ssthresh - INTEGER
+	Limited Slow-Start for TCP with large congestion windows defined in
+	RFC3742. Limited slow-start is a mechanism to limit growth of the
+	congestion window on the region where congestion window is larger than
+	tcp_max_ssthresh. A TCP connection with a large congestion window could
+	have its congestion window increased by thousand (or even more)
+	segments per RTT by the traditional slow-start procedure which might be
+	counter-productive to TCP performance when packet losses start to
+	occur. With limited slow-start TCP increments congestion window by no
+	more than tcp_max_ssthresh/2 segments per RTT when the congestion
+	window is above tcp_max_ssthresh.
+	Default: 0 (off)
+
 tcp_max_syn_backlog - INTEGER
 	Maximal number of remembered connection requests, which are
 	still did not receive an acknowledgment from connecting client.
-- 
1.5.0.6