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

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Message-ID: <20110311055918.GA10228@xanadu.blop.info>
Date:	Fri, 11 Mar 2011 06:59:18 +0100
From:	Lucas Nussbaum <lucas.nussbaum@...ia.fr>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org, Sangtae Ha <sha2@...u.edu>
Subject: Re: [PATCH] Make CUBIC Hystart more robust to RTT variations

On 10/03/11 at 15:28 -0800, Stephen Hemminger wrote:
> 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.

According to the bug report, the server is running RHEL6 (with CUBIC and
Hystart), it's the client that is running RHEL5.
-- 
| Lucas Nussbaum             MCF Université Nancy 2 |
| lucas.nussbaum@...ia.fr         LORIA / AlGorille |
| http://www.loria.fr/~lnussbau/  +33 3 54 95 86 19 |
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