Re: [LARTC] Pfifo_fast "Unknown qdisc" and asking for basic design

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Mark Lidstone wrote:
> 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 ]
> 	qdisc pfifo_fast 0: dev eth1 [Unknown qdisc, optlen ]
> 
> Unfortunately I cannot add pfifo_fast as a queue type (I was hoping to
> use one - see below).  Have I missed something?

pfifo_fast is what you get as default on interfaces - it's just like 
prio but not meant to be used by you - I suppose you could nest prios, 
but in this case I think what you need is just pfifo or bfifo.


> 
> 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?

You would be better off having htb as root so you can throttle traffic 
to below link speed. You can htb's prio parameter to do much the same.

Sfq is nice but the perturb causes packet reordering I would think about 
trying to seperate each customers traffic into bulk and interactive 
aswell and just use sfq on bulk.

Andy.


> 
> 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@bmtseatech.co.uk
> Website: www.bmtseatech.co.uk
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