[altq 440] Re: RSVP with Queueing Question

[Kenjiro Cho <kjc@csl.sony.co.jp>]

Takashi Ikebe wrote:
> I have question. please help me!
> When reserve bandwidth with RESV signal, and in the case data packet doesn`t
> rearch yet,
> does empty packet send or another connection`s packet send?
> I mean that generally(CBQ, WFQ) does another connection can use reserved
> bandwidth if reserved bandwidth doesn`t used?

Depends on the queueing discipline and how it is configured.
A work conserving queueing discipline (e.g., WFQ) transmits packet as
long as there are backlogged packets.  So, unused reserved bandwidth
is used by other traffic.
On the other hand, a non-work conserving queueing discipline (e.g.,
CBQ) can be configured not to redistribute excess bandwidth.

> In case of WFQ, when connection created, then create new queue, and send
> packet by round-robin.
> So I wonder, if there is no packet in the queue, how WFQ works? send empty
> packet? or skip to next queue??

It just skips empty queues.

-Kenjiro