Hi stef;
I do two testings about bounded and CBQ rate control.
1. The first script is that I give inital EF bandwidth (6Mbit, bounded),
BE (4Mbit, borrow), the total is 10Mbit( bounded), Late, I change the
reservation of EF every 5 min.
for example.
I use "tc class change dev eth1 .....8Mbit......." change EF from
6Mbit to
8Mbit,
then I run "tc class ls dev eth1" to see, EF bw is indeed to change to
8Mbit, but BE doen''t change
question:
Since BE can borrow, when EF change bw, how I can let BE change its''s
bw as
well automatically. (EF and BE shift resource)
2. The second case I test "bounded for EF" , again, interface 100Mbit,
the
sum of EF+BE is 10Mbit(bounded). But it seems doen''t workI
don''t know why
My script for this testing is following, take from
http://dsmpls.atlantis.rug.ac.be/
#!/bin/bash
# This script will set-up an example DS tree
TC=/usr/local/bin/tc
$TC qdisc add dev eth1 root handle 1:0 dsmark indices 64 default_index 0
#tcindex classid 2.2 #set_tc_index
$TC filter add dev eth1 parent 1:0 protocol ip tcindex mask 0xfc shift 2
$TC filter add dev eth1 parent 1:0 protocol ip prio 1 tcindex mask 0xfc
shift
2 pass_on
# Second a CBQ qdisc is used in order to support EF, and BE classes
$TC qdisc add dev eth1 parent 1:0 handle 2:0 cbq bandwidth 100Mbit cell 8
avpkt 1000 mpu 64
$TC filter add dev eth1 parent 2:0 protocol ip prio 1 tcindex mask 0xf0
shift
4 pass_on
# add interior layer of CBQ to limit total traffic for EF and BE is 10Mbit
$TC class add dev $i parent 2:0 classid 2:1 cbq bandwidth 100Mbit rate
10Mbit \
avpkt 1000 prio 8 allot 1514 weight 1Mbit cell 8 maxburst 21 bounded
## Definition of the CBQ leaf classes to support EF and BE
## EF class
$TC class add dev eth1 parent 2:1 classid 2:5 cbq bandwidth 100Mbit rate
6Mbit
avpkt 1000 prio 1 bounded allot 1514 weight 600kbit maxburst 10 defmap 0
$TC qdisc add dev eth1 parent 2:5 pfifo limit 10
$TC filter add dev eth1 parent 1:0 protocol ip prio 1 handle 0x2e tcindex
classid 1:151
$TC filter add dev eth1 parent 2:0 protocol ip prio 1 handle 5 tcindex
classid
2:5
## BE class specific setup
$TC class add dev eth1 parent 2:1 classid 2:6 cbq bandwidth 100Mbit rate
3Mbit
avpkt 1000 prio 7 allot 1514 weight 300kbit maxburst 21 borrow
$TC qdisc add dev eth1 parent 2:6 red limit 600KB min 150KB max 450KB burst
200 avpkt 1000 bandwidth 100Mbit probability 0.4
$TC filter add dev eth1 parent 1:0 protocol ip prio 1 handle 0x0 tcindex
classid 1:161
$TC filter add dev eth1 parent 2:0 protocol ip prio 1 handle 6 tcindex
classid
2:6
## OSPF - RSVP Pipe class specific setup
$TC class add dev eth1 parent 2:1 classid 2:7 cbq bandwidth 100Mbit rate
1Mbit
avpkt 1000 prio 1 bounded allot 1514 weight 100kbit maxburst 10 defmap
0
$TC qdisc add dev eth1 parent 2:5 pfifo limit 10
$TC filter add dev eth1 parent 1:0 protocol ip prio 1 handle 0x30 tcindex
classid 1:171
$TC filter add dev eth1 parent 2:0 protocol ip prio 1 handle 7 tcindex
classid
2:7
For BE class, no matter overlimt, underlimi, at limt, seemd fine, but for EF
class, bounded doesn''t work, still can borrow bandwidth from BE?
I show two case in my testing
A: First case, I send BE traffic underlimt, 2Mbit (initial allocation is
3Mbit). For EF, inital allocaion is 6Mbit, the sum of EF+BE is 10Mbit, since
CBQ not accurate, The measue result for sum is 12Mbit
sender (EF) EF measure (actual) BE measure (actual)
2M 2M 2M
4M 4.1M 2M
6M 6.2M 2M
8M 8.3M 2M
10M 9.7M 2M
15M 9.7M 2M
20M 9.7M 2M
I think since EF is bounded, when you send more traffic >6Mbit, should drop,
but seems it borrow some bandwidth for BE or his parent...??
B: second case is when BE overlimt , I send BE 20Mbit
sender(EF) EF measure (actual) BE measure (actual)
3M 3M 8.7M
4M 4.1M 7.6M
6M 6.2M 5.5M
7M 5.9M 5.9M
8M 5.9M 5.9M
10M 5.9M 5.9M
15M 5.9M 5.9M
in this case, after EF overlimit, he drop, keep max assigned BW (6Mbit), BE
share the remaining BW. I think it is correct.
Can you tell me why bounded for EF doesn''t work?
thanks for your help
regards,
yuxiao
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