netdev - Re: [PATCH] tcp_cubic: enable TCP timestamps

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Date:	Tue, 08 Mar 2011 11:38:53 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	lucas.nussbaum@...ia.fr
Cc:	sangtae.ha@...il.com, shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH] tcp_cubic: enable TCP timestamps

From: Lucas Nussbaum <lucas.nussbaum@...ia.fr>
Date: Tue, 8 Mar 2011 20:36:02 +0100

> My other patch mitigates the performance problem by making it harder for
> Hystart to abort slow start. But after a few days working on this issue,
> I'm wondering whether Hystart shouldn't be completely rewritten to work
> on the usec values, or disabled by default.

I am of the opinion that Hystart, like TCP VEGAS, fundamentally cannot
work.

It's disabled in several major distributions because of the performance
problems you noticed, and this was on my own personal recommendation.
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