netdev - Re: [PATCH] CUBIC v2.3 with new improved slow start

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Message-ID: <20081103144923.244158f3@extreme>
Date:	Mon, 3 Nov 2008 14:49:23 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	"Sangtae Ha" <sangtae.ha@...il.com>
Cc:	"David Miller" <davem@...emloft.net>,
	"Rick Jones" <rick.jones2@...com>, rhee@....ncsu.edu,
	netdev@...r.kernel.org
Subject: Re: [PATCH] CUBIC v2.3 with new improved slow start

On Mon, 3 Nov 2008 17:19:52 -0500
"Sangtae Ha" <sangtae.ha@...il.com> wrote:

> Hi all,
> 
> We had rather extensive testings with one MacOSX receiver of the
> latest Leopard release.
> As we had one macbook pro available in the lab, all the testing
> results are with the one receiver.
> Based on the tested results, MacOSX also doesn't break the algorithm.
> 
> Please see the results at the following:
> 
> http://netsrv.csc.ncsu.edu/wiki/index.php/TCP_Testing#Testing_with_MacOSX
> 
> One thing I observed with FreeBSD and MacOS receivers is that
> even though we set the large send and recv buffer and run the iperf
> with the large fixed memory,
> without manually setting the window scale parameter to a higher value,
> the receiver window is limited to 64K << 3 (which is the default of MacOSX).
> 
> Because of that, I had to set the window scailing parameter from 3 to
> 13 manually.
> This also affects SACK not triggering with the default window scale factor of 3.
> Linux certainly doesn't have this problem.
> 
> Probably, MacOSX and FreeBSD may need some updates for this issue.
> 
> Thank you for all your feedbacks,
> 
> Sangtae

Thanks for the pro-active testing.
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