netdev - Re: [PATCH] Make CUBIC Hystart more robust to RTT variations

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Message-ID: <20110310152848.7b515511@nehalam>
Date:	Thu, 10 Mar 2011 15:28:48 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Lucas Nussbaum <lucas.nussbaum@...ia.fr>
Cc:	netdev@...r.kernel.org, Sangtae Ha <sha2@...u.edu>
Subject: Re: [PATCH] Make CUBIC Hystart more robust to RTT variations

On Tue, 8 Mar 2011 10:32:15 +0100
Lucas Nussbaum <lucas.nussbaum@...ia.fr> wrote:

> CUBIC Hystart uses two heuristics to exit slow start earlier, before
> losses start to occur. Unfortunately, it tends to exit slow start far too
> early, causing poor performance since convergence to the optimal cwnd is
> then very slow. This was reported in
> http://permalink.gmane.org/gmane.linux.network/188169 and
> https://partner-bugzilla.redhat.com/show_bug.cgi?id=616985

Ignore the RHEL bug. RHEL 5 ships with TCP BIC (not CUBIC) by default.
There are many research papers which show that BIC is too aggressive,
and not fair.

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