From: John Heffner <jheffner@psc.edu>
To: lists@andyfurniss.entadsl.com
Cc: netdev@vger.kernel.org
Subject: Re: Controlling TCP window size
Date: Tue, 16 May 2006 14:28:23 -0400 [thread overview]
Message-ID: <446A19C7.1000302@psc.edu> (raw)
In-Reply-To: <4469B251.3050901@andyfurniss.entadsl.com>
Andy Furniss wrote:
>
> I've been doing some testing of my new wan connection and noticed that
> when I specify a window with ip route it still changes after a while.
Looks like this is occurring in net/ipv4/tcp_input.c:tcp_rcv_space_adjust().
The problem really is that the window_clamp variable is overloaded.
It's used as a kind of cache for rcvbuf -> window conversion, but also
as a user-settable bound in window size. On examination, it looks like
this is also broken (in that window size won't increase) if a user does
a setsockopt(SO_RCVBUF). Can we make window_clamp a true clamp? Then
we can get rid of the hack of raising it in tcp_rcv_space_adjust(). I
can cook up a patch if interested.
-John
next prev parent reply other threads:[~2006-05-16 18:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-16 11:06 Controlling TCP window size Andy Furniss
2006-05-16 18:28 ` John Heffner [this message]
2006-05-16 18:36 ` Andy Furniss
2006-05-16 18:48 ` John Heffner
2006-05-16 23:01 ` David S. Miller
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