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Date: Fri, 23 Nov 2012 17:03:48 +0100
From: Ingo Flaschberger <if@xip.at>
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To: freebsd-net@freebsd.org
Subject: Re: Low Bandwidth on intercontinental connections
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The sender dump shows, that the network-card does tso.

 From Marc's dump at receiver site:

network io bits/sec:
     FreeBSD: http://devel.crossip.net/freebsd_receiver.jpg
     Linux: http://devel.crossip.net/linux_receiver.jpg

During the "breaks" between the transfer, I see tcp retransmissions (but 
slow).

window scaling:
     FreeBSD: http://devel.crossip.net/freebsd_window_size.jpg
     Linux: http://devel.crossip.net/linux_window_size.jpg

But window scaling keeps

time sequence graph (stevens):
     FreeBSD: 
http://devel.crossip.net/freebsd_time_sequence_graph_stevens.jpg
     Linux: http://devel.crossip.net/linux_time_sequence_graph_stevens.jpg

round trip time:
     FreeBSD: http://devel.crossip.net/freebsd_round_trip_time.jpg
     Linux: http://devel.crossip.net/linux_round_trip_time.jpg

Kind regards,
     Ingo Flaschberger