Re: [LARTC] SEPARATING VOIP AND SURFING

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Ricardo Soria wrote:
> Dear list:
> 
> I have a problem I cannot handle yet, and need to
> solve it as soon as possible.  Would be very greatful
> with anybody who can help me.
> 
> I have a 512/512 link to internet, that I want to
> share between several computers.  I have eth0, with a
> public IP address, conected to Internet, and also,
> eth1, with a private IP address, for network with the
> surfing computers.  I have a main class with the whole
> 512kbit, then 2 child classes in this way (you can see
> the complete script at the end):
> 
> class 1: rate = ceil = 64kbit, prio 0, for VOIP
> class 2: rate = ceil = 448kbit, for SURFING
> 
> Class 2 is subdivided again in about 20 classes, for
> 20 surfing computers, this way:
> 
> class 3: rate = 18kbit, ceil = 448kbit, prio 1, SURF
> 
> I have a classical problem (I think).  As you can see,
> first 64kbit are for VOIP, so, it is necesary the best
> quality, and the minimal delays.  64Kbit is pretty
> enough for 1 VOIP channel (it is supposed to really
> use no more than 20kbit).  And also, the 64kbit class
> has the highest priority.  Nevertheless, specially
> when all 20 users are surfing, or some user are
> browsing weight pages, or when 2 or more users are
> downloading at the same time, I cannot get VOIP to
> work properly, because quality becomes very poor.  I
> have made all kind of imaginable test, probes and
> combinations, trying to test with different burst
> values for classes, attaching sfq qdiscs to all leaf
> classes, then only to surfing classes, then only to
> VOIP classes, and even, gaming with R2Q/Quantums, that
> would not be necessary, because 64Kbit is very more
> than enough.
> 
> So please, does anyone have any idea how to completely
> separate VOIP and SURFING, making 2 independent
> channels, without one service affect to other ??
> 
> Very thanks in advance.
> 
> If you are still able to read, after having read all
> this stuff, here goes my script as is now...
> 
> Best Regards to everybody.
> 
> Ricardo.
> 
> ========================
> 
> #!/bin/bash
> 
> tc qdisc add dev eth1 root handle 1: htb default 121
> r2q 1
> tc qdisc add dev eth0 root handle 1: htb default 20
> r2q 5
> 
> tc class add dev eth1 parent 1: classid 1:1 htb rate
> 512kbit ceil 512kbit
> tc class add dev eth0 parent 1: classid 1:1 htb rate
> 512kbit ceil 512kbit
> 
> tc class add dev eth1 parent 1:1 classid 1:10 htb rate
> 64kbit ceil 64kbit prio 0
> tc class add dev eth0 parent 1:1 classid 1:10 htb rate
> 64kbit ceil 64kbit prio 0
> 
> tc class add dev eth1 parent 1:1 classid 1:20 htb rate
> 448kbit ceil 448kbit prio 1
> tc class add dev eth0 parent 1:1 classid 1:20 htb rate
> 448kbit ceil 448kbit prio 1
> 
> # PER MACHINE OR IP CLASSES
> 
> tc class add dev eth1 parent 1:20 classid 1:90 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:91 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:101 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:102 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:103 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:104 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:105 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:106 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:107 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:108 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:109 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:110 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:111 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:112 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:113 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:114 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:115 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:116 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:117 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:118 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:119 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:120 htb
> rate 18kbit ceil 448kbit prio 1
> tc class add dev eth1 parent 1:20 classid 1:121 htb
> rate 18kbit ceil 448kbit prio 1
> 
> # SFQ QDISCS PER LEAF CLASS
> 
> # VOIP
> tc qdisc add dev eth0 parent 1:10 handle 10: sfq
> perturb 10
> tc qdisc add dev eth0 parent 1:20 handle 20: sfq
> perturb 10
> 
> #SURFING
> tc qdisc add dev eth1 parent 1:10 handle 10: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:90 handle 90: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:91 handle 91: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:101 handle 101: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:102 handle 102: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:103 handle 103: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:104 handle 104: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:105 handle 105: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:106 handle 106: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:107 handle 107: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:108 handle 108: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:109 handle 109: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:110 handle 110: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:111 handle 111: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:112 handle 112: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:113 handle 113: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:114 handle 114: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:115 handle 115: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:116 handle 116: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:117 handle 117: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:118 handle 118: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:119 handle 119: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:120 handle 120: sfq
> perturb 10
> tc qdisc add dev eth1 parent 1:121 handle 121: sfq
> perturb 10
> 
> # FILTERS
> 
> # VOIP
> tc filter add dev eth0 protocol ip parent 1:0 prio 0
> u32 match ip src 216.118.226.244 flowid 1:10
> tc filter add dev eth1 protocol ip parent 1:0 prio 0
> u32 match ip dst 216.118.226.244 flowid 1:10
> 
> # SURFING
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.2   flowid 1:90
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.3   flowid 1:91
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.101 flowid 1:101
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.102 flowid 1:102
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.103 flowid 1:103
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.104 flowid 1:104
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.105 flowid 1:105
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.106 flowid 1:106
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.107 flowid 1:107
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.108 flowid 1:108
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.109 flowid 1:109
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.110 flowid 1:110
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.111 flowid 1:111
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.112 flowid 1:112
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.113 flowid 1:113
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.114 flowid 1:114
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.115 flowid 1:115
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.116 flowid 1:116
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.117 flowid 1:117
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.118 flowid 1:118
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.119 flowid 1:119
> tc filter add dev eth1 protocol ip parent 1:0 prio 1
> u32 match ip dst 192.168.0.120 flowid 1:120
> 
> # END


I haven't read the script properly, but generally three points come to mind.

You need to back off more from link speed - total ceils to about 80% and 
share that between interactive and bulk.

SFQ default queue length is too long to be used as you want - use esfq 
or change the length to 16 in the source code (see www.docum.org FAQs).

You should really only send bulk to SFQ - It will behave better than a 
fifo if you mix traffic - but at the low rates you set it will still 
cause too much delay for interactive (small UDP/TCP).

Andy.


_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/