netdev - Re: [PATCH] tcp: Implement a two-level initial RTO as per draft RFC 2988bis-02.

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Date:	Thu, 19 May 2011 08:10:40 +0200
From:	Alexander Zimmermann <alexander.zimmermann@...sys.rwth-aachen.de>
To:	tsuna <tsunanet@...il.com>
Cc:	David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, hagen@...u.net, eric.dumazet@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: Implement a two-level initial RTO as per draft RFC
 2988bis-02.

Hi,

Am 19.05.2011 um 06:33 schrieb tsuna:

> Presumably if the user decides to tweak these knobs, they'll know
> what's appropriate for their environment.

Are you sure? I'm not. I fully agree with David that minRTO is
something that a user shout not control at all

> Or are you suggesting that
> one value be derived from the other?  (e.g. tcp_initial_fallback_rto =
> 3 * tcp_initial_rto)
> 
>> As a result of all of this, I do not really think this is something
>> the user should control at all.
>> 
>> I really would rather see the initial RTO be static and be set to 1
>> with fallback RTO of 3.
> 
> I can also provide a simple patch for this if you want to start from
> there.  And then maybe we can discuss having a runtime knob some more
> :-)
> 
> -- 
> Benoit "tsuna" Sigoure
> Software Engineer @ www.StumbleUpon.com

//
// Dipl.-Inform. Alexander Zimmermann
// Department of Computer Science, Informatik 4
// RWTH Aachen University
// Ahornstr. 55, 52056 Aachen, Germany
// phone: (49-241) 80-21422, fax: (49-241) 80-22222
// email: zimmermann@...rwth-aachen.de
// web: http://www.umic-mesh.net
//


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