From: John Heffner <jheffner@psc.edu>
To: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Ion Badulescu <lists@limebrokerage.com>,
linux-kernel@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
linux-net@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: Possible BUG in IPv4 TCP window handling, all recent 2.4.x/2.6.x kernels
Date: Fri, 2 Sep 2005 10:16:57 -0400 [thread overview]
Message-ID: <4629cfbdf1af310d5c6cffd7178cff5b@psc.edu> (raw)
In-Reply-To: <20050902134807.GB12617@yakov.inr.ac.ru>
On Sep 2, 2005, at 9:48 AM, Alexey Kuznetsov wrote:
> Hello!
>
>> If you overflow the socket's memory bound, it ends up calling
>> tcp_clamp_window(). (I'm not sure this is really the right thing to
>> do
>> here before trying to collapse the queue.)
>
> Collapsing is too expensive procedure, it is rather an emergency
> measure.
> So, tcp collapses queue, when it is necessary, but it must reduce
> window
> as well.
Right.
I wonder if clamping the window though is too harsh. Maybe just
setting the rcv_ssthresh down is better? Why the distinction between
in-order and out-of-order data? Because you expect in-order data to be
a persistent case?
-John
next prev parent reply other threads:[~2005-09-02 14:17 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-01 22:30 Possible BUG in IPv4 TCP window handling, all recent 2.4.x/2.6.x kernels Ion Badulescu
2005-09-01 22:43 ` David S. Miller
2005-09-01 22:49 ` Jesper Juhl
2005-09-01 22:53 ` David S. Miller
2005-09-01 22:53 ` Ion Badulescu
2005-09-01 23:37 ` Jesper Juhl
2005-09-02 2:51 ` John Heffner
2005-09-02 6:28 ` David S. Miller
2005-09-02 14:05 ` lists
2005-09-02 14:10 ` John Heffner
2005-09-02 14:33 ` lists
2005-09-02 14:48 ` John Heffner
2005-09-02 15:43 ` Ion Badulescu
2005-09-02 13:02 ` Guillaume Autran
2005-09-02 13:48 ` Ion Badulescu
2005-09-02 13:52 ` Alexey Kuznetsov
2005-09-02 14:11 ` John Heffner
2005-09-02 13:48 ` Alexey Kuznetsov
2005-09-02 14:16 ` John Heffner [this message]
2005-09-02 15:11 ` Alexey Kuznetsov
2005-09-02 18:36 ` Alexey Kuznetsov
2005-09-02 20:57 ` Ion Badulescu
2005-09-02 21:18 ` Alexey Kuznetsov
2005-09-02 23:09 ` Ion Badulescu
2005-09-28 16:31 ` Ion Badulescu
2005-09-29 15:17 ` Alexey Kuznetsov
2005-09-29 15:34 ` Guillaume Autran
2005-09-29 16:04 ` John Heffner
2005-09-29 18:16 ` David S. Miller
2005-09-30 0:29 ` David S. Miller
2005-09-02 4:51 ` Noritoshi Demizu
2005-09-02 5:20 ` Stephen Hemminger
2005-09-02 5:45 ` Noritoshi Demizu
2005-09-02 6:11 ` Noritoshi Demizu
2005-09-02 12:11 ` Ion Badulescu
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