netdev - Using HTB over MultiQ

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Date:	Thu, 7 Nov 2013 17:12:31 +0400
From:	"Anton 'EvilMan' Danilov" <littlesmilingcloud@...il.com>
To:	netdev@...r.kernel.org
Subject: Using HTB over MultiQ

Hello.

I'm experimenting with high performance linux router with 10G NICs.
On high traffic rates the performance are limited by the lock of root
queue discipline. For avoid impact of locking i've decided to build
QoS scheme over the multiq qdisc.

And I have the issues with use to multiq discipline.

My setup:
1. Multiq qdisc is on top of interface.
2. To every multiq class i've attached htb discipline with own
hierachy of child classes.
3. The filters (u32 with hashing) are attached to the root multiq discipline.

Graphical scheme of hierarchy -
http://pixpin.ru/images/2013/11/07/multiq-hierarchy1.png

Fragments of script:

#add top qdisc and classes
 qdisc add dev eth0 root handle 10: multiq
 qdisc add dev eth0 parent 10:1 handle 11: htb
 class add dev eth0 parent 11: classid 11:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:2 handle 12: htb
 class add dev eth0 parent 12: classid 12:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:3 handle 13: htb
 class add dev eth0 parent 13: classid 13:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:4 handle 14: htb
 class add dev eth0 parent 14: classid 14:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:5 handle 15: htb
 class add dev eth0 parent 15: classid 15:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:6 handle 16: htb
 class add dev eth0 parent 16: classid 16:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:7 handle 17: htb
 class add dev eth0 parent 17: classid 17:1 htb rate 1250Mbit
 qdisc add dev eth0 parent 10:8 handle 18: htb
 class add dev eth0 parent 18: classid 18:1 htb rate 1250Mbit

#add leaf classes and qdiscs (several hundreds)
 ...
 class add dev eth0 parent 11:1 classid 11:1736 htb rate 1024kbit
 qdisc add dev eth0 parent 11:1736 handle 1736 pfifo limit 50
 ...

But I see zero statistics on the leaf htb classes and nonzero
statistics on the classifier filters:

~$ tc -s -p filter list dev eth1
 ...
 filter parent 10: protocol ip pref 5 u32 fh 2:f2:800 order 2048 key
ht 2 bkt f2 flowid 11:1736  (rule hit 306 success 306)
   match IP src xx.xx.xx.xx/30 (success 306 )
 ...

~$ tc -s -s -d c ls dev eth1 classid 11:1736
 class htb 11:1736 parent 11:1 leaf 1736: prio 0 quantum 12800 rate
1024Kbit ceil 1024Kbit burst 1599b/1 mpu 0b overhead 0b cburst 1599b/1
mpu 0b overhead 0b level 0
  Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
  rate 0bit 0pps backlog 0b 0p requeues 0
  lended: 0 borrowed: 0 giants: 0
  tokens: 195312 ctokens: 195312

I think I've lost from view the some aspects of settings.
Has anyone setuped the like complex scheme over the multiq discipline?

-- 
Anton.
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