[Eug-lug] ftp package w/ "throttle control"

[Ben Barrett]

The main thing I'm not seeing covered in this thread is the difference
between throttling the application versus at the interface or router is that
shared traffic (even if only other use of the same protocol) is also
affected.  There are many possible situations where you can dedicate a
throttled virtual interface for such use, which is easy if you've dedicated
a xen instance to handling backup synchronizations...
but beware ye experimenters, see if stereo sounds so good through one wire
:)
On a similar subject, if you do go throttling an asymmetric uplink like
cable, as might be Mr. O's case, watch out that your max up-rate is greater
than for instance your housemate's throttled connection (assuming throttling
is symmetric, or consider up-rate)... since TCP uses handshakes, syn/ack, if
your upstream is maxed out then the rest of your downstream is effectively
useless.  There are some prioritization schemes IIRC which help in these
cases; I think BSD's pf had some of the first open-sourced ones in recent
years.

cheers,

    Ben
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