netdev - Re: [PATCH 3/3] tcp_cubic: fix low utilization of CUBIC with HyStart

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Message-ID: <20110314062824.GA22755@xanadu.blop.info>
Date:	Mon, 14 Mar 2011 07:28:24 +0100
From:	Lucas Nussbaum <lucas.nussbaum@...ia.fr>
To:	Sangtae Ha <sangtae.ha@...il.com>
Cc:	Stephen Hemminger <stephen.hemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	Injong Rhee <rhee@...u.edu>,
	Bill Fink <billfink@...dspring.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] tcp_cubic: fix low utilization of CUBIC with HyStart

On 13/03/11 at 19:07 -0500, Sangtae Ha wrote:
> Hi Lucas,
> 
> Thank you for reporting this problem and the results below show what
> happened with low resolution clocks.
> The detailed testing setup and results at
> http://netsrv.csc.ncsu.edu/wiki/index.php/HyStart_testing_between_Princeton_and_NCSU
> I will add the results in long rtt paths soon.

Thanks. What do you use to generate those graphs?

The graphs from HyStart(fixed) are a bit strange. Did HyStart really
detect something? It seems that it exited slow start due to losses, not
due to detection, since cwnd is decreased.
-- 
| 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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