Re: [LARTC] SEPARATING VOIP AND SURFING

[Ricardo Soria <ricardo_soria@yahoo.com>]

 --- Andy Furniss <andy.furniss@dsl.pipex.com>
escribió: 
> 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.
> 
> 
>  

Dear Andy:

Very thanks for your answer.  However, I need a little
bit more extended explanation.

First, you say that I should "back off more from link
speed - total ceils to about 80% and share that
between interactive and bulk".  So, do you mean that
if I have a total 512Kbit link, and 2 child classes, I
should not divide the whole 512kbit between the 2
classes, but, I should only divide 410kbit between
them, and share the remaining 102kbit between them?? 
Or do you mean I should only consider 410kbit as the
whole link capacity??

Second, you say that I should not use SFQ as a
sub-qdisc, because of the lenght of the queue, being
it ESFQ (new for me) a better choice.  But later, you
say I should use SFQ for bulk traffic (I think you
refer surfing as "bulk", and voip as "interactive"). 
So, should I use SFQ for bulk classes and ESFQ for
interactive classes ??  Or, should I use ESFQ for all
leaf classes??  Or, should I use ESFQ for bulk classes
and default (pfifo, I think) for interactive classes??

Very thanks for your help.

Best Regards.

Ricardo.

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