[LARTC] borrowing+priority, help req

From: Andras.Horvath@cern.ch
To: lartc@vger.kernel.org
Subject: [LARTC] borrowing+priority, help req
Date: Thu, 24 Jul 2003 07:19:37 +0000	[thread overview]
Message-ID: <marc-lartc-105903125214535@msgid-missing> (raw)

Hi!

I'm new to this list :) I have a problem (or misunderstanding) trying to
set up the very basic example: giving priority to outgoing traffic from
a host (on 100Mbit Ethernet) towards a subset of nodes based on their IP
address (not on QoS flags), while allowing others to use all 'leftover'
bandwidth.

I have tried with htb and cbq qdiscs as well and neither seems to be
doing what I want. :) Here is my CBQ setup:

tc qdisc add dev eth1 root handle 1:0 cbq bandwidth 100Mbit \
	 rate 100Mbit avpkt 1000 cell 8
tc class add dev eth1 parent 1:0 classid 1:1 cbq bandwidth 100Mbit rate 100Mbit \
	 weight 1Mbit prio 8 allot 1514 cell 8 maxburst 20 avpkt 1000 bounded
tc class add dev eth1 parent 1:1 classid 1:3 cbq bandwidth 100Mbit rate 80Mbit \
	 weight 0.8Mbit prio 5 allot 1514 cell 8 maxburst 20 avpkt 1000
tc class add dev eth1 parent 1:1 classid 1:4 cbq bandwidth 100Mbit rate 20Mbit \
	 weight 0.2Mbit prio 5 allot 1514 cell 8 maxburst 20 avpkt 1000
tc qdisc add dev eth1 parent 1:3 handle 30: sfq
tc qdisc add dev eth1 parent 1:4 handle 40: sfq
tc filter add dev eth1 parent 1:0 protocol ip prio 1 u32 match \ 
	ip dst 10.0.0.0/16 flowid 1:3
tc filter add dev eth1 parent 1:0 protocol ip prio 1 u32 match \
	ip dst 10.1.0.0/16 flowid 1:4

What this simply does for me is that when both IP ranges start
'fighting' for bandwidth they get about 50% each while as I understood
(? :) from the HOWTO they should have got a 8:2 ratio.
If I make one of 1:3 or 1:4 'bounded', the other is able to borrow its
bandwidth, but not the other way around (no surprise).

I tried the prio qdisc too:

tc qdisc add dev eth1 root handle 1: prio
tc qdisc add dev eth1 parent 1:1 handle 10: sfq perturb 10
tc qdisc add dev eth1 parent 1:2 handle 20: sfq perturb 10
tc qdisc add dev eth1 parent 1:3 handle 30: sfq perturb 10
tc filter add dev eth1 parent 1: protocol ip prio 1 u32 match \
	ip dst 10.1.0.0/16 flowid 1:3
tc filter add dev eth1 parent 1: protocol ip prio 1 u32 match \
	 ip dst 10.0.0.0/16 flowid 1:1

which seems to have 'no effect' as well (50% bandwidth goes to both
parties).

The packets indeed make it to the right class/qdisc according to tc -s.
Measurements were taken using iptables counters.

Could you help me (either by pointing out where I don't understand
something or providing a working example)?

Thanks a lot in advance,
Andras
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