Choosing a qlen?

[Simon Tennant]

qlen must be the worst term to search for on the internet: the results
show endless ifconfig output.

I am trying to work out the optimal qlen for:

* ADSL outbound
* wireless outbound.

My current understanding is that it is the buffer in the kernel before
the packets hit the buffer on the ethernet card. So a nice fat qlen
should allow better traffic prioritisation? Or am I misguided?

If it helps, I'm trying to prioritise traffic and reduce jitter between
my asterisk box on the internet and my wifi voip fone hanging off an
internal subnet.

S.