Speed limiters and unused bandwidth.

[kripz]

p2p Catch all
p2pCatchAll: When enabled, all uncategorized traffic is fed to the p2p queue.
Bandwidth:   The limit you want to apply.

Is that a hard limit? When there's 0 traffic except for p2p, will it user over x%?

[KOM]

Limiting and shaping are two different things.  With a limiter, it is a hard cap regardless of maximum bandwidth.  With a shaper, low-priority queues will get to use all bandwidth until something more important comes along.  This is a simplified explanation of how it really works.