Hfsc configuration problems

[Christopher McGee]

I've been trying to get hfsc working properly, but I'm obviously doing 
something wrong because I keep getting errors like this:

pfctl: link-sharing sc exceeds parent's sc

Here's my current configuration:

altq on $ext_if bandwidth 100Mb hfsc queue { queue1, queue2, queue3 }
queue queue1 bandwidth 500Kb priority 7 hfsc(realtime 128Kb red)
queue queue2 { queue2_1, queue2_2, queue2_3, queue2_4, queue2_5 }
  queue queue2_1 priority 5 hfsc(realtime 3Mb linkshare 100% default red)
  queue queue2_2 bandwidth 1.5Mb priority 3 hfsc(red)
  queue queue2_3 bandwidth 1Mb hfsc(red)
  queue queue2_4 bandwidth 4Mb hfsc(red)
  queue queue2_5 priority 3 hfsc(linkshare 100% red)
queue queue3 { queue3_1, queue3_2 }
  queue queue3_1 hfsc(linkshare 100% red)
  queue queue3_2 hfsc(linkshare 100% red)

I've given some minimum bandwidth to queues. I want queue2_1, 2_5, 3_1, 
3_2 to be able to utilize all of the spare bandwidth when they need it.  
I've read over the man pages, however, documentation on hfsc seems 
fairly limited.

Chris