DIOCADDALTQ: Invalid argument

[beno]

Thank you for all of your comments and help.

According to my googling, this error is thrown when one has too many cbq 
classes. The limit, apparently, is 256. I don't have 1/20th of that 
limit, so I must be doing something else wrong. Here is the part of my 
pf.conf file in question:

# class-based queueing (cbq)
altq on $ext_if cbq bandwidth 3Mb queue { ssh, standard }
 queue ssh bandwidth 500Kb cbq(default) { ssh_login, ssh_bulk }
  queue ssh_login bandwidth 100Kb cbq(default)
  queue ssh_bulk bandwidth 400Kb cbq(borrow, priority 2)
 queue standard bandwidth 2500Kb cbq(ecn, priority 2) { http, ftp, 
email, other }
  queue http bandwidth 1900Kb cbq(default) (ecn, borrow)
  queue ftp bandwidth 200Kb cbq(ecn, borrow, priority 2)
  queue email bandwidth 200Kb cbq(ecn, priority 3)
  queue other bandwidth 200Kb cbq(ecn, priority 2)

I have these options loaded in my kernel:

# Packet Filters
device pf
device pflog
device pfsync
options         ALTQ
options         ALTQ_CBQ        # Class Bases Queuing (CBQ)
options         ALTQ_RED        # Random Early Detection (RED)
options         ALTQ_RIO        # RED In/Out
options         ALTQ_HFSC       # Hierarchical Packet Scheduler (HFSC)
options         ALTQ_PRIQ       # Priority Queuing (PRIQ)

According to the tutorial, one cannot have more than one default per 
queue, which I am (perhaps mistakenly) interpreting to mean that one can 
(and I presume should) have one default per queue and per sub-queue, 
since they are nested and therefore semi-autonomous/independent. I am 
admittedly confused concerning priq and priority.
TIA,
beno