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From: tsuna <tsunanet@gmail.com>
To: Alexander Zimmermann <alexander.zimmermann@comsys.rwth-aachen.de>
Cc: David Miller <davem@davemloft.net>,
	kuznet@ms2.inr.ac.ru, pekkas@netcore.fi, jmorris@namei.org,
	yoshfuji@linux-ipv6.org, kaber@trash.net, hagen@jauu.net,
	eric.dumazet@gmail.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tcp: Implement a two-level initial RTO as per draft RFC 2988bis-02.
Date: Thu, 19 May 2011 00:07:09 -0700	[thread overview]
Message-ID: <BANLkTimB70u15aGt8BeDNRneZUAMOpfjcQ@mail.gmail.com> (raw)
In-Reply-To: <8C5DF277-320D-4DEB-A133-EEC301DE58DC@comsys.rwth-aachen.de>

On Wed, May 18, 2011 at 11:52 PM, Alexander Zimmermann
<alexander.zimmermann@comsys.rwth-aachen.de> wrote:
>> So we're talking about a [200ms ; 120s] range no matter what.
>
> Why is 200ms a valid lower bound for initRTO? I'm aware of
> measurements that 1s is save for Internet, but I don't know of any
> studies that 200ms is save...

The constants that are quoted aren't specific to the initRTO.  They're
used to bound the RTO as it gets adjusted during the TCP session.  See
`tcp_set_rto' in tcp_input.c for reference.

-- 
Benoit "tsuna" Sigoure
Software Engineer @ www.StumbleUpon.com

  reply	other threads:[~2011-05-19  7:07 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-17  7:40 [PATCH] tcp: Expose the initial RTO via a new sysctl Benoit Sigoure
2011-05-17  7:40 ` Benoit Sigoure
2011-05-17  8:01   ` Alexander Zimmermann
2011-05-17  8:34     ` Eric Dumazet
2011-05-17  8:07   ` Eric Dumazet
2011-05-17 11:02     ` Hagen Paul Pfeifer
2011-05-17 11:02       ` Hagen Paul Pfeifer
2011-05-17 12:20       ` Eric Dumazet
2011-05-18 10:43     ` Benoit Sigoure
2011-05-18 19:26       ` David Miller
2011-05-18 19:40         ` tsuna
2011-05-18 19:52           ` David Miller
2011-05-18 20:20             ` Hagen Paul Pfeifer
2011-05-18 20:23               ` David Miller
2011-05-18 20:27                 ` Hagen Paul Pfeifer
2011-05-20 10:27               ` H.K. Jerry Chu
2011-05-20 11:00                 ` Hagen Paul Pfeifer
2011-05-20 11:00                   ` Hagen Paul Pfeifer
2011-05-20 12:37                   ` Alan Cox
2011-05-21  0:06                   ` H.K. Jerry Chu
2011-05-31 14:48                     ` tsuna
2011-05-31 15:25                       ` Hagen Paul Pfeifer
2011-05-31 15:25                         ` Hagen Paul Pfeifer
2011-05-31 15:28                         ` tsuna
2011-05-31 15:43                           ` Hagen Paul Pfeifer
2011-05-31 15:43                             ` Hagen Paul Pfeifer
2011-05-19  2:22             ` [PATCH] tcp: Implement a two-level initial RTO as per draft RFC 2988bis-02 Benoit Sigoure
2011-05-19  2:22               ` Benoit Sigoure
2011-05-19  2:36               ` David Miller
2011-05-19  3:56                 ` tsuna
2011-05-19  4:14                   ` David Miller
2011-05-19  4:33                     ` tsuna
2011-05-19  5:46                       ` David Miller
2011-05-19  6:36                         ` [PATCH] tcp: Lower the initial RTO to 1s " Benoit Sigoure
2011-05-19  6:36                           ` Benoit Sigoure
2011-05-19 17:42                           ` Yuchung Cheng
2011-05-19  6:47                         ` Benoit Sigoure
2011-05-19  6:47                           ` Benoit Sigoure
2011-05-19 20:16                           ` David Miller
2011-05-19  6:10                       ` [PATCH] tcp: Implement a two-level initial RTO " Alexander Zimmermann
2011-05-19  6:25                         ` tsuna
2011-05-19  6:36                           ` Alexander Zimmermann
2011-05-19  6:42                             ` tsuna
2011-05-19  6:52                               ` Alexander Zimmermann
2011-05-19  7:07                                 ` tsuna [this message]
2011-05-19  8:02                                 ` Hagen Paul Pfeifer
2011-05-19  8:02                                   ` Hagen Paul Pfeifer
2011-05-19 16:40                                   ` tsuna
2011-05-19 16:55                                     ` Alexander Zimmermann
2011-05-19 17:11                                       ` tsuna
2011-05-19 19:27                                         ` David Miller
2011-05-19 20:30                                           ` tsuna
2011-05-20  2:01           ` [PATCH] tcp: Expose the initial RTO via a new sysctl H.K. Jerry Chu

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