Pfifo_fast "Unknown qdisc" and asking for basic design advice

Linux Advanced Routing and Traffic Control

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Hi all,

I've done a search through the archives but I can't find a
cause/solution to this.

I'm running a FC4 box with the stock 2.6.12 kernel and a FC2 box with a
stock 2.6.9 kernel.  I'm obviously using
iproute2 and the patched tc.

When I clear down the qdiscs with "tc qdisc del dev <DEV> root" I get
the following in response to "tc qdisc":

	qdisc pfifo_fast 0: dev eth0 [Unknown qdisc, optlen=20]
	qdisc pfifo_fast 0: dev eth1 [Unknown qdisc, optlen=20]

Unfortunately I cannot add pfifo_fast as a queue type (I was hoping to
use one - see below).  Have I missed something?

Secondly, I was wondering if anyone could look over what I am trying to
do and point out any stupid mistakes I've made.  I am trying to get the
following setup working:

              root
               |
               |
              PRIO
             / | \
      ______/  |  \______
     |         |         |
     0         |         2
 pfifo_fast    1        sfq
              HTB__________
             / | \         \
      ______/  |  \______   \______
     |         |         |         |
    sfq       sfq       sfq       sfq

Basically, we have 4 companies that will be sharing bandwidth on a
connection (the four sfq's at the bottom) and some video conferencing
equipment that needs priority over everything (the pfifo_fast).  Have I
misunderstood anything vital here?

Many thanks,

Mark Lidstone
IT and Network Support Administrator

BMT SeaTech Ltd
Grove House, Meridians Cross, 7 Ocean Way Ocean Village, Southampton.
SO14 3TJ. UK
Tel: +44 (0)23 8063 5122         
Fax: +44 (0)23 8063 5144

E-Mail:  mailto:mark.lidstone@xxxxxxxxxxxxxxxx
Website: www.bmtseatech.co.uk
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