netdev - Re: RE: A Linux TCP SACK Question

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Date:	Fri, 04 Apr 2008 16:40:52 -0500
From:	Wenji Wu <wenji@...l.gov>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	'John Heffner' <johnwheffner@...il.com>,
	'Netdev' <netdev@...r.kernel.org>
Subject: Re: RE: A Linux TCP SACK Question


> On Fri, 4 Apr 2008, Wenji Wu wrote:
> 
> > 
> > >I'd suggest that you don't waste too much effort for 2.6.24. 
> ...Most of it 
> > >is recoded/updated since then.
> > 
> > I just tried it on 2.6.25-rc8. The result is still the same: the throughput
> > with SACK on is less than with SACK off.
> 
> Hmm, can you also try if playing around with FRTO setting makes some 
> difference (tcp_frto sysctl)?

Still the same, I just tried with FRTO, FACK. No difference, SACK on is worse than SACK off.

wenji
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