netdev - Re: tbf/htb qdisc limitations

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Date:	Thu, 14 Oct 2010 08:50:05 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Bill Fink <billfink@...dspring.com>
Cc:	Rick Jones <rick.jones2@...com>,
	Steven Brudenell <steven.brudenell@...il.com>,
	netdev@...r.kernel.org
Subject: Re: tbf/htb qdisc limitations

On Thu, Oct 14, 2010 at 08:09:39AM +0000, Jarek Poplawski wrote:
> On Thu, Oct 14, 2010 at 03:13:54AM -0400, Bill Fink wrote:
> > TSO/GSO was disabled and was using 9000-byte jumbo frames
> > (and specified mtu 9000 to tc command).
> > 
> > Here was one attempt I made using tbf:
> > 
> > tc qdisc add dev eth2 root handle 1: prio
> > tc qdisc add dev eth2 parent 1:1 handle 10: tbf rate 8900mbit buffer 1112500 limit 10000 mtu 9000
> > tc filter add dev eth2 protocol ip parent 1: prio 1 u32 match ip dst 192.168.1.23 flowid 10:1
> > 
> > I tried many variations of the above, all without success.
> 
> The main problem are smaller packets. If you had (almost) only 9000b
> frames this probably could work. [...]

On the other hand, e.g. the limit above seems too low wrt mtu & rate.

Jarek P.
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