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

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Message-ID: <BANLkTikZasOVfr2zTfXVjPqQsnzy9Hk5uA@mail.gmail.com>
Date:	Thu, 19 May 2011 10:11:50 -0700
From:	tsuna <tsunanet@...il.com>
To:	Alexander Zimmermann <alexander.zimmermann@...sys.rwth-aachen.de>
Cc:	Hagen Paul Pfeifer <hagen@...u.net>,
	David Miller <davem@...emloft.net>, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.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.

On Thu, May 19, 2011 at 9:55 AM, Alexander Zimmermann
<alexander.zimmermann@...sys.rwth-aachen.de> wrote:
> Exactly. This is the point. It's *your* environment. However, TCP is
> general purpose. And for the wider internet 1s is know to be save. See the
> measurements in the draft that Mark Allman run.

That's right, there's no one-size-fits-all solution.  That's why I'm
in favor of keeping a reasonably conservative default (say 1s to 3s,
so we don't break the Internets) and giving people a knob to adjust it
to whatever makes sense for them.

Looking through the kernel, I see that SCTP already has knobs for
this: sctp_rto_initial, sctp_rto_min, sctp_rto_max.  You can even
control the constants used to update rttvar and srtt: sctp_rto_alpha,
sctp_rto_beta

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