ALTQ w/priq not doing its job properly

[Matt Pearce]

I have been putting ALTQ with the priq disciple through its paces the 
past week and it doesnt seem to be doing as its told.  As you can see 
from my rules ack traffic is fairly high up on my list and almost 
exclusively has top priority, however, when i'm running a p2p program on 
my desktop uploading at 22k/sec and then I try to download an iso (or 
whatever else) the download speed never reaches the max 164k/sec i'm 
capable of getting, instead it hovers around 100-120k/sec, which I 
believe is the result of slow outbound ack packets.  Am I right or is 
there something else i've missed ??

Also I am not using RED so no packets should be dropped, I do get 
dropped packets on q_out if things are a little to loaded ie 50/50 is 
reached for the qlimit, and there is another problem, my qlimit is set 
to 100 but it never changes !!  I am assuming that the pfctl -vsq 
display that says qlength is the current length of the qlimit ??

Does anyone know why these oddities are occurning ??  And is the warning 
below considered false advertising ?? :-

QUOTE FROM PF FAQ    "It is important to note that when using PRIQ you 
must plan your queues very carefully. Because PRIQ /always/ processes a 
higher priority queue before a lower priority one, it's possible for a 
high priority queue to cause packets in a lower priority queue to be 
delayed or dropped if the high priority queue is receiving a constant 
stream of packets."

So far it looks like it doesnt ALWAYS processes rules properly, 
especially with regards to acks.

altq on $ext_if bandwidth 200Kb qlimit 100 priq queue { q_ssh_shell_out, 
q_ssh_bulk_out, q_out, q_http_out, /
q_dns_out, q_vpn_out, q_mail_out, q_wwwb_out, q_dnsb_out, q_udp_out, 
q_voip_out, q_icmp_out, q_ack_out }
queue q_udp_out         priority 15 priq
queue q_icmp_out        priority 14 priq
queue q_ack_out         priority 13 priq
#queue q_voip_out       priority 12 priq
queue q_dnsb_out        priority 11 priq
queue q_wwwb_out        priority 10 priq
queue q_mail_out        priority 9 priq
queue q_ssh_shell_out   priority 8 priq
queue q_ssh_bulk_out    priority 7 priq
queue q_vpn_out         priority 4 priq
queue q_dns_out         priority 3 priq
queue q_http_out        priority 2 priq
queue q_out             priority 1 priq(default)

I hope i'm wrong in my assumptions and please correct me if I am as i'm 
happy to eliminate a potential source of problems.

Thanks,
Matt.