netdev - Re: can TCP socket send buffer be over used?

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Message-ID: <alpine.DEB.1.10.1008040932030.19930@uplift.swm.pp.se>
Date:	Wed, 4 Aug 2010 09:33:06 +0200 (CEST)
From:	Mikael Abrahamsson <swmike@....pp.se>
To:	Jack Zhang <jack.zhang2011@...il.com>
cc:	netdev@...r.kernel.org
Subject: Re: can TCP socket send buffer be over used?

On Tue, 3 Aug 2010, Jack Zhang wrote:

> For example, when I set the send buffer size to 128 KB, i could get a
> throughput up to 43 Mbps, which seems to be impossible as the (buffer
> size) / RTT is only 10 Mbps.

Are you sure the buffer actually corresponds to the congestion window TCP 
uses? I think you should use wireshark to dump the traffic and look in the 
TCP headers of the packets to see what is actually going on on the wire.

-- 
Mikael Abrahamsson    email: swmike@....pp.se
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