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From: <BeckW@telekom.de>
To: <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] Random idea in reaction to all the discussion of TCP	flavours - timestamps?
Date: Wed, 16 Mar 2011 10:04:48 +0100	[thread overview]
Message-ID: <580BEA5E3B99744AB1F5BFF5E9A3C67D01708ED2A4@HE111648.emea1.cds.t-internal.com> (raw)
In-Reply-To: <4D7F4121.40307@freedesktop.org>


Jim Wrote:
> Back last summer, to my surprise, when I asked Van Jacobson about my
> traces, he said all the required proof was already present in my traces,
> since modern Linux (and I presume other) operating systems had time
> stamps in them (the TCP timestamps option).
>
> Here's the off the wall idea.  The buffers we observe are often many
> times (orders of magnitude) larger than any rational RTT.
>
> So the question I have is whether there is some technique whereby
> monitoring the timestamps that may already be present in the traffic
> (and knowing what "sane" RTT's are) that we can start marking traffic in
> time prevent the worst effects of bloating buffers?
This reminds me of a related concept, using the TTL really as 'Time To Live' (in today's IP, it's more of a 'Remaining Hop Count). According to RfC 791, a router that buffers a packet by n seconds must decrease its TTL by n. I doubt that many routers implement this properly.

Wolfgang


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  parent reply	other threads:[~2011-03-16  9:05 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-15 10:36 Jim Gettys
2011-03-15 14:40 ` Jim Gettys
2011-03-15 16:47   ` Jonathan Morton
2011-03-15 17:59     ` Don Marti
2011-03-15 18:14       ` Rick Jones
2011-03-15 18:31         ` John W. Linville
2011-03-15 19:40           ` Jonathan Morton
2011-03-15 19:59             ` Rick Jones
2011-03-15 20:51             ` John W. Linville
2011-03-15 21:31               ` Rick Jones
2011-03-16  0:32                 ` John W. Linville
2011-03-16  1:02                   ` Rick Jones
2011-03-15 22:01               ` Jonathan Morton
2011-03-15 22:19                 ` Stephen Hemminger
2011-03-15 22:26                   ` Jonathan Morton
2011-03-15 22:36                     ` Rick Jones
2011-03-15 22:40                       ` Jonathan Morton
2011-03-15 22:42                         ` Stephen Hemminger
2011-03-15 22:52                       ` Eric Dumazet
2011-03-15 23:02                         ` Rick Jones
2011-03-15 23:12                         ` Jonathan Morton
2011-03-15 23:25                           ` Rick Jones
2011-03-15 23:33                             ` Jonathan Morton
2011-03-15 23:46                         ` Dave Täht
2011-03-16  0:49                           ` Jonathan Morton
2011-03-16  1:02                             ` Dave Täht
2011-03-16  1:28                               ` Jonathan Morton
2011-03-16  1:59                                 ` Dave Täht
2011-03-16  2:23                                   ` Jonathan Morton
2011-03-16 22:22                                     ` [Bloat] Random idea in reaction to all the discussion of TCPflavours " Richard Scheffenegger
2011-03-16 23:38                                       ` richard
2011-03-16 23:50                                         ` Rick Jones
2011-03-17 12:05                                       ` Fred Baker
2011-03-17 12:18                                         ` Fred Baker
2011-03-17 17:27                                           ` Dave Täht
2011-03-18 18:30                                           ` Richard Scheffenegger
2011-03-18 18:49                                             ` Fred Baker
2011-03-20 11:40                                               ` Jonathan Morton
2011-03-20 22:18                                                 ` david
2011-03-20 22:45                                                   ` Jonathan Morton
2011-03-20 22:50                                                     ` Dave Täht
2011-03-20 22:55                                                       ` grenville armitage
2011-03-20 23:04                                                         ` Dave Täht
2011-03-20 23:14                                                           ` Jonathan Morton
2011-03-20 23:19                                                             ` Dave Täht
2011-03-20 23:23                                                               ` Dave Täht
2011-03-20 22:58                                                       ` Jonathan Morton
2011-03-21  1:28                                                     ` david
2011-03-21  1:56                                                       ` Wesley Eddy
2011-03-18 18:27                                       ` [Bloat] Random idea in reaction to all the discussion ofTCPflavours " Richard Scheffenegger
2011-03-16 22:07                           ` [Bloat] Random idea in reaction to all the discussion of TCPflavours " Richard Scheffenegger
2011-03-17  0:10                             ` Jonathan Morton
2011-03-16  0:47                 ` [Bloat] Random idea in reaction to all the discussion of TCP flavours " John W. Linville
2011-03-16 20:07                   ` Jim Gettys
2011-03-17  2:26                     ` Jonathan Morton
2011-03-17 18:22                       ` Rick Jones
2011-03-17 21:50                         ` Jonathan Morton
2011-03-17 22:20                           ` Rick Jones
2011-03-17 22:56                             ` Jonathan Morton
2011-03-18  1:36                               ` Justin McCann
2011-03-18  5:51                             ` Eric Dumazet
2011-03-15 16:34 ` Jonathan Morton
2011-03-15 18:13   ` Stephen Hemminger
2011-03-16  5:41 ` Fred Baker
2011-03-16  6:26   ` Jonathan Morton
2011-03-16  8:55 ` [Bloat] Random idea in reaction to all the discussion of TCPflavours " Richard Scheffenegger
2011-03-16  9:04 ` BeckW [this message]
2011-03-16 22:48   ` [Bloat] Random idea in reaction to all the discussion of TCP flavours " Fred Baker
2011-03-16 23:23     ` Jonathan Morton
2011-03-17  8:34     ` BeckW

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