On Sat, 2010-09-11 at 12:17 -0700, Tom Eastep wrote: 
> 
> I'm guessing it is 'cls_flow'.

Bingo!

> Shorewall 4.4.6 did not accurately detect
> the availability of that capability.

Explains it then.  :-)

But strangeness ensues.  My connection is capable of 15Mbps down/1Mbps
up.  When I set the IN-BANDWIDTH absurdly high, like 24mbit, of course,
I see the full 15Mbps down.  However when I go down to 12mbit, I only
see between 7-8Mbps down.  Setting IN-BANDWIDTH to 15mbit yields between
11-12Mbps and setting IN-BANDWIDTH to 18mbit yields 14-15Mbps.

Any thoughts as to why the discrepancies?

On another note, maybe I am just misunderstanding, but it seems this
Simple TC mode is only dealing with downstream bandwidth and not
upstream bandwidth (even though, typically, on consumer and even some
small business connections, there is lots of downstream bandwidth
compared to upstream bandwidth).  Is my understanding correct here?

Priority dequeuing seems like a reasonable approach for the downstream
side where we cannot really shape bandwidth anyway (that is more
properly done upstream), but what about preventing saturation of the
upstream bandwidth interrupting latency sensitive applications like VIOP
and whatnot?

b.

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