netdev - RE: A Linux TCP SACK Question

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Date:	Sat, 5 Apr 2008 00:39:32 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Wenji Wu <wenji@...l.gov>
cc:	'John Heffner' <johnwheffner@...il.com>,
	'Netdev' <netdev@...r.kernel.org>
Subject: RE: A Linux TCP SACK Question

On Sat, 5 Apr 2008, Ilpo Järvinen wrote:

> 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)?

...Assuming it wasn't disabled already. If you find that there's 
significant difference, you could try also with SACK+basic FRTO (set 
the tcp_frto sysctl to 1).

-- 
 i.