[Bug 194453] [dummynet] pipe config bw parameter is limited to 2Gbits per second

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194453

--- Comment #8 from boba at boba.name ---
> By that i mean the following:
> First of all change the internals of dummynet to opportunistically
> check the timer whenever there is traffic, rather than relying on
> a one-tick granularity. When dummynet was first implemented the timer
> was the 8254, reading it took forever, and 250-1000us granularity was
> adequate for the <10Mbit/s range it was meant to emulate.
> 
> Second, the default parameters (1ms, 50 slots queue) limit the capacity of
> a pipe to some 600 Mbit/s with 1500-byte packets. Probably the code should
> print warnings if queue_capacity/tick is too far from the desired rate.
> 
> Third, the bandwidth value is internally multiplied by other factor
> in the execution of the scheduling algorithms. If you bump the data type
> from 31 to 32 or 64 bits, you also need to check that the other computations
> do not overflow.
> 
> In any case if you decide to go through this route please pass the code
> by me for review before committing. -- luigi

As I understood, this new framework in FreeBSD now can handle 10GB of traffic
(http://info.iet.unipi.it/~luigi/netmap/) and supports pipes and dummynet.

Is it production-stable ? Is there some sort of "how-to" on how to use it ?

boba.

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