Re: Effective bandwidth reduction over WAN

From: Jeff Rosowski (rosowskij_at_ie.ymp.gov)
Date: 08/04/05

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    Date: Thu, 4 Aug 2005 10:04:43 -0700 (PDT)
To: Terry Browning <linux-focus@nihil.co.uk>

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    >> The results were
    >>
    >> 0 latency FTP – Ave. 39.5 mbps SCP – Ave. 39.4 mbps SFTP –
    >> Ave. 38.8 mbps
    >>
    >> 60 millisec FTP – Ave. 37.7 mbps SCP – Ave. 2.9 mbps SFTP –
    >> Ave. 2.9 mbps
    >>
    >> 100 millisec FTP – Ave. 33.0 mbps SCP – Ave. 2.0 mbps SFTP –
    >> Ave. 1.8 mbps
    >>
    >> Can anyone tell me why the throughput of SCP and SFTP drop so
    >> drastically when we try to use SSP protocols over a WAN?

    Your problem is TCP itself. You can tweak your tcp window sizes, to let
    you have more packets in flight. You could also use something that would
    open multiple tcp connections for a single transfer.
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