netdev - Re: setsockopt()

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Message-ID: <20080708064324.GA11776@2ka.mipt.ru>
Date:	Tue, 8 Jul 2008 10:43:24 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Bill Fink <billfink@...dspring.com>,
	David Miller <davem@...emloft.net>, aglo@...i.umich.edu,
	shemminger@...tta.com, netdev@...r.kernel.org, rees@...ch.edu,
	bfields@...ldses.org
Subject: Re: setsockopt()

On Mon, Jul 07, 2008 at 11:29:31PM -0700, Roland Dreier (rdreier@...co.com) wrote:
> nuttcp -T30 -i1 ends up with:
> 
> 14465.0625 MB /  30.01 sec = 4043.6073 Mbps 82 %TX 2 %RX
> 
> while setting the window even to 128 KB with
> nuttcp -w128k -T30 -i1 ends up with:
> 
> 36416.8125 MB /  30.00 sec = 10182.8137 Mbps 90 %TX 96 %RX
> 
> so it's a factor of 2.5 with nuttcp.  I've never seen other apps behave
> like that -- for example NPtcp (netpipe) only gets slower when
> explicitly setting the window size.
> 
> Strange...

Maybe nuttcp by default sets very small socket buffer size?

-- 
	Evgeniy Polyakov
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