From: John Heffner <jheffner@psc.edu>
To: David Miller <davem@davemloft.net>
Cc: rick.jones2@hp.com, ian.mcdonald@jandi.co.nz, netdev@vger.kernel.org
Subject: Re: [PATCH] make _minimum_ TCP retransmission timeout configurable
Date: Wed, 29 Aug 2007 18:52:48 -0400 [thread overview]
Message-ID: <46D5F8C0.4080801@psc.edu> (raw)
In-Reply-To: <46D5F7C8.8090806@psc.edu>
John Heffner wrote:
>> What exactly causes such a huge delay? What is the TCP measured RTO
>> in these circumstances where spurious RTOs happen and a 3 second
>> minimum RTO makes things better?
>
> I haven't done a lot of work on wireless myself, but my understanding is
> that one of the biggest problems is the behavior link-layer
> retransmission schemes. They can suddenly increase the delay of packets
> by a significant amount when you get a burst of radio interference. It's
> hard for TCP to gracefully handle this kind of jump without some minimum
> RTO, especially since wlan RTTs can often be quite small.
(Replying to myself) Though F-RTO does often help in this case.
-John
next prev parent reply other threads:[~2007-08-29 22:52 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-29 20:52 [PATCH] make _minimum_ TCP retransmission timeout configurable Rick Jones
2007-08-29 21:13 ` Eric Dumazet
2007-08-29 22:11 ` Rick Jones
2007-08-29 21:32 ` Ian McDonald
2007-08-29 21:46 ` David Miller
2007-08-29 22:10 ` Ian McDonald
2007-08-29 22:23 ` David Miller
2007-08-29 22:13 ` Stephen Hemminger
2007-08-29 22:28 ` David Miller
2007-08-29 22:51 ` Stephen Hemminger
2007-08-29 22:58 ` NCR, was " John Heffner
2007-08-29 22:59 ` David Miller
2007-08-29 22:32 ` Rick Jones
2007-08-29 22:29 ` Rick Jones
2007-08-29 22:35 ` David Miller
2007-08-29 22:48 ` John Heffner
2007-08-29 22:52 ` John Heffner [this message]
2007-08-29 22:53 ` Edgar E. Iglesias
2007-08-29 23:06 ` Rick Jones
2007-08-29 23:15 ` David Miller
2007-08-29 23:31 ` Rick Jones
2007-08-30 5:22 ` Krishna Kumar2
2007-08-30 17:10 ` Rick Jones
2007-08-29 23:44 ` John Heffner
2007-09-05 19:04 ` Ilpo Järvinen
2007-09-06 20:39 ` David Miller
2007-08-29 22:09 ` Rick Jones
2007-08-29 22:20 ` David Miller
2007-08-29 22:33 ` Ian McDonald
2007-08-29 22:37 ` David Miller
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