[LARTC] HTB does not respect the prio parameter

From: "Martin Björnsson" <martin.bjornsson@businessecurity.com>
To: lartc@vger.kernel.org
Subject: [LARTC] HTB does not respect the prio parameter
Date: Wed, 29 Aug 2007 08:06:28 +0000	[thread overview]
Message-ID: <46D52904.4040809@businessecurity.com> (raw)

Hi all,

I'm experimenting with HTB and the prio parameter and it does not give me results I
expect. I've created 4 HTB classes:

1:10 TCP ACKs                       (prio 0)
1:20 TCP traffic on dst port 10001  (prio 1)
1:30 TCP traffic on dst port 10000  (prio 2)
1:40 Default                        (prio 3)

ceil and rate parameters are the same for all 4 classes (rate is 1000kbit and ceil is
55000kbit).

Then I start 2 TCP flows on src/dst ports 10000 and 10001. The packets seem to be
correctly classified by the filter (I get hits on classes 10, 20 and 30).

The problem is that I get the same throughput on both TCP flows. Shouldn't I get about
1000kbit through class 30 and much more through class 20 since it has higher priority?

Here's my setup script:

#!/bin/sh
/bin/tc qdisc add dev eth0 root handle 1: htb default 40 && \
/bin/tc class add dev eth0 parent 1:0 classid 1:1 htb rate 55000kbit ceil 55000kbit
quantum 60000 && \
/bin/tc class add dev eth0 parent 1:1 classid 1:10 htb rate 1000kbit ceil 55000kbit prio 0
quantum 60000 && \
/bin/tc class add dev eth0 parent 1:1 classid 1:20 htb rate 1000kbit ceil 55000kbit prio 1
quantum 60000 && \
/bin/tc class add dev eth0 parent 1:1 classid 1:30 htb rate 1000kbit ceil 55000kbit prio 2
quantum 60000 && \
/bin/tc class add dev eth0 parent 1:1 classid 1:40 htb rate 1000kbit ceil 55000kbit prio 3
quantum 60000 && \
/bin/tc filter add dev eth0 parent 1:0 prio 99 handle 2: protocol ip u32 divisor 256 && \
/bin/tc filter add dev eth0 parent 1:0 protocol ip prio 10 u32 \
  ht 2:0: \
  match u8 0x06 0xff at 9 \
  match u8 0x10 0xff at nexthdr+13 \
  flowid 1:10 && \
/bin/tc filter add dev eth0 parent 1:0 protocol ip prio 10 u32 \
  ht 2:0: \
  match u8 0x06 0xff at 9 \
  match u16 0x2711 0xffff at nexthdr+2 \
  flowid 1:20 && \
/bin/tc filter add dev eth0 parent 1:0 protocol ip prio 10 u32 \
  ht 2:0: \
  match u8 0x06 0xff at 9 \
  match u16 0x2710 0xffff at nexthdr+2 \
  flowid 1:30 && \
/bin/tc filter add dev eth0 parent 1:0 protocol ip prio 99 u32 ht 800:: offset at 0 mask
0x0f00 shift 6 plus 0 match u8 0x40 0xf0 at 0 link 2: && \
/bin/tc qdisc add dev eth0 parent 1:10 handle 20: red limit 1000KB min 10KB max 300KB
avpkt 1000 burst 100 probability 0.02 && \
/bin/tc qdisc add dev eth0 parent 1:20 handle 30: red limit 1000KB min 10KB max 300KB
avpkt 1000 burst 100 probability 0.02 && \
/bin/tc qdisc add dev eth0 parent 1:30 handle 40: red limit 1000KB min 10KB max 300KB
avpkt 1000 burst 100 probability 0.02 && \
/bin/tc qdisc add dev eth0 parent 1:40 handle 50: red limit 1000KB min 10KB max 300KB
avpkt 1000 burst 100 probability 0.02 && \

Regards,
Martin
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