[LARTC] What is the reccomended minimum rate for leaf htb class for accurate operation?

[LARTC] What is the reccomended minimum rate for leaf htb class for accurate operation?

[Zviad O. Giorgadze]

Hi,

I'm trying to setup QoS in my TSL box. Following to mailing list reccomendations I changed PSCHED_CPU but can't get accurate shaping with HTB. I have disabled HYSTERESIS also (by setting it to 0).
I have Intel Celeron 1.8Mhz (TSC supported I think).

******** My script ******
tc qdisc add dev eth0 root handle 1: htb default 22 r2q 10

# Class corresponding interface throughput
tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit ceil 100mbit

# Class for GLOBAL traffic
tc class add dev eth0 parent 1:1 classid 1:20 htb rate 115kbit ceil 1mbit

# Classes for PC-s
tc class add dev eth0 parent 1:20 classid 1:21 htb rate 48kbit ceil 1mbit prio 2
tc class add dev eth0 parent 1:20 classid 1:22 htb rate 24kbit ceil 1mbit prio 3
tc class add dev eth0 parent 1:20 classid 1:23 htb rate 12kbit ceil 1mbit prio 5
tc class add dev eth0 parent 1:20 classid 1:24 htb rate 12kbit ceil 1mbit prio 5
tc class add dev eth0 parent 1:20 classid 1:25 htb rate 12kbit ceil 1mbit prio 5

tc qdisc add dev eth0 parent 1:21 handle 21: pfifo
tc qdisc add dev eth0 parent 1:22 handle 22: pfifo
tc qdisc add dev eth0 parent 1:23 handle 23: pfifo
tc qdisc add dev eth0 parent 1:24 handle 24: pfifo
tc qdisc add dev eth0 parent 1:25 handle 25: pfifo

# Put flow to corresponding classes 
tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.1 flowid 1:21
tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.2 flowid 1:22
tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.3 flowid 1:23
tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.4 flowid 1:24
tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.5 flowid 1:25
******** End of script *********


What is the reccomended minimum rate for leaf htb class for accurate operation?
Can I change somesing in my script to get more accurate results?

Regrads,

Zviad



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Re: [LARTC] What is the reccomended minimum rate for leaf htb class

[Andreas Klauer]

Zviad O. Giorgadze wrote:
> # Class for GLOBAL traffic
> tc class add dev eth0 parent 1:1 classid 1:20 htb rate 115kbit ceil 1mbit

Does different rate / ceil for the root class make sense?

> # Classes for PC-s
> tc class add dev eth0 parent 1:20 classid 1:21 htb rate 48kbit ceil 1mbit prio 2
> tc class add dev eth0 parent 1:20 classid 1:22 htb rate 24kbit ceil 1mbit prio 3
> tc class add dev eth0 parent 1:20 classid 1:23 htb rate 12kbit ceil 1mbit prio 5
> tc class add dev eth0 parent 1:20 classid 1:24 htb rate 12kbit ceil 1mbit prio 5
> tc class add dev eth0 parent 1:20 classid 1:25 htb rate 12kbit ceil 1mbit prio 5

I guess class 1:21 gets to borrow all the traffic up to 1mbit and the 
others get nothing at all. You really want that? These rates and prios 
don't make sense to me, what do you intend to do?

I'd remove the prio parameter, increase global traffic class rate to 
1mbit, and increase PC class rates so that they add up to 1mbit.

Andreas
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Re: [LARTC] What is the reccomended minimum rate for leaf htb class for accurate operation?

[mjoachimiak]

So what about minimum rate?
I have rate 13kbit. My connection is sometimes congested and and I have much
loss of packets which are going from clients to the internet trough htb box.
From box to the internet there is no any packet loss. Is this normal using
HTB with congested connection?
----- Original Message ----- 
From: "Andreas Klauer" <Andreas.Klauer@metamorpher.de>
To: <zgiorgadze@gol.ge>
Cc: <lartc@mailman.ds9a.nl>
Sent: Wednesday, October 06, 2004 10:14 AM
Subject: Re: [LARTC] What is the reccomended minimum rate for leaf htb class
for accurate operation?


> Zviad O. Giorgadze wrote:
> > # Class for GLOBAL traffic
> > tc class add dev eth0 parent 1:1 classid 1:20 htb rate 115kbit ceil
1mbit
>
> Does different rate / ceil for the root class make sense?
>
> > # Classes for PC-s
> > tc class add dev eth0 parent 1:20 classid 1:21 htb rate 48kbit ceil
1mbit prio 2
> > tc class add dev eth0 parent 1:20 classid 1:22 htb rate 24kbit ceil
1mbit prio 3
> > tc class add dev eth0 parent 1:20 classid 1:23 htb rate 12kbit ceil
1mbit prio 5
> > tc class add dev eth0 parent 1:20 classid 1:24 htb rate 12kbit ceil
1mbit prio 5
> > tc class add dev eth0 parent 1:20 classid 1:25 htb rate 12kbit ceil
1mbit prio 5
>
> I guess class 1:21 gets to borrow all the traffic up to 1mbit and the
> others get nothing at all. You really want that? These rates and prios
> don't make sense to me, what do you intend to do?
>
> I'd remove the prio parameter, increase global traffic class rate to
> 1mbit, and increase PC class rates so that they add up to 1mbit.
>
> Andreas
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Re: [LARTC] What is the reccomended minimum rate for leaf htb classfor

[Andreas Klauer]

Zviad O. Giorgadze wrote:
> My ISP provides guarantied 115kbit bandwidth for GLOBAL TRAFFIC. During the low load period (early morning, evening, night) customers can get up to 1mbit traffic.

That's download traffic we're talking about, since you seem to be 
shaping on your local LAN interface? Variable rate ISPs are tough
to shape right, I guess...

Does this 115kbit vs. 1mbit thing solely depend on ISP load, or does it 
depend on day of time? In the latter case, I'd let a cron job replace 
the HTB class structure, so that you have 115kbit ceil during the day 
when you really only get 115kbit and 1mbit ceil during the night when 
you actually get 1mbit.

But I guess it's not that easy, huh?

> According to PRIO settings I try to give all available bandwidth (above the guarantied rate) to IP address. I think that all other IP-s get it's guarantied rate or may be I'm wrong?

You have a 100mbit line, of which you only allow 1mbit to be used (Why 
make a 100mbit class then?). Unknown traffic (LAN, most likely) goes to 
class 1:22 (Why? Shouldn't only ISP traffic go there?). There is no 
distinction between ISP and LAN traffic at all... does that mean that 
there is no other traffic than ISP from/to your HTB box?

Does anyone know how HTB performs on such a line? My guess would be that 
HTB doesn't have a clue that there are actually only 115kbit, and thus 
will allow classes to borrow too much, letting other classes starve.

Andreas
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Re: [LARTC] What is the reccomended minimum rate for leaf htb classfor accurate operation?

[mjoachimiak]

Your gues is right. To get HTB work correctly you must know rate parameter
for your connection also known as CIR.
Coud you tell what minimum rate your clients have?
----- Original Message ----- 
From: "Andreas Klauer" <Andreas.Klauer@metamorpher.de>
To: <zgiorgadze@gol.ge>
Cc: <lartc@mailman.ds9a.nl>
Sent: Wednesday, October 06, 2004 12:00 PM
Subject: Re: [LARTC] What is the reccomended minimum rate for leaf htb
classfor accurate operation?


> Zviad O. Giorgadze wrote:
> > My ISP provides guarantied 115kbit bandwidth for GLOBAL TRAFFIC. During
the low load period (early morning, evening, night) customers can get up to
1mbit traffic.
>
> That's download traffic we're talking about, since you seem to be
> shaping on your local LAN interface? Variable rate ISPs are tough
> to shape right, I guess...
>
> Does this 115kbit vs. 1mbit thing solely depend on ISP load, or does it
> depend on day of time? In the latter case, I'd let a cron job replace
> the HTB class structure, so that you have 115kbit ceil during the day
> when you really only get 115kbit and 1mbit ceil during the night when
> you actually get 1mbit.
>
> But I guess it's not that easy, huh?
>
> > According to PRIO settings I try to give all available bandwidth (above
the guarantied rate) to IP address. I think that all other IP-s get it's
guarantied rate or may be I'm wrong?
>
> You have a 100mbit line, of which you only allow 1mbit to be used (Why
> make a 100mbit class then?). Unknown traffic (LAN, most likely) goes to
> class 1:22 (Why? Shouldn't only ISP traffic go there?). There is no
> distinction between ISP and LAN traffic at all... does that mean that
> there is no other traffic than ISP from/to your HTB box?
>
> Does anyone know how HTB performs on such a line? My guess would be that
> HTB doesn't have a clue that there are actually only 115kbit, and thus
> will allow classes to borrow too much, letting other classes starve.
>
> Andreas
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

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Re: [LARTC] What is the reccomended minimum rate for leaf htb classfor

[Andreas Klauer]

mjoachimiak@poczta.onet.pl wrote:
> Your gues is right. To get HTB work correctly you must know rate parameter
> for your connection also known as CIR.
> Coud you tell what minimum rate your clients have?

My worst HTB class has rate&ceil 778bps.

I guess the lower the rate, the less accurate the result. It can't be 
accurate, because the class already exceeds it's limit by sending just 
one single packet.

Maybe it's more accurate in the long run, but I don't have any 
statistics to prove that. Anyway, the traffic for that class is damn 
slow, and that's all I need to know. ;-)

Andreas

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Re: [LARTC] What is the reccomended minimum rate for leaf htb class for

[gypsy]

"Zviad O. Giorgadze" wrote:
> # Put flow to corresponding classes
> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.1 flowid 1:21
> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.2 flowid 1:22
> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.3 flowid 1:23
> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.4 flowid 1:24
> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.5 flowid 1:25

If you are NATting, there is no 192.168.0.anything because the address
has been NATted.

If not, add a prio parameter to these filter lines where prio is NOT 0.

If you are NATting, use an iptables mark and filter on fwmark.

Other than that, I can't help you.

gypsy
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Re: [LARTC] What is the reccomended minimum rate for leaf htb class for accurate operation?

[Stef Coene]

On Wednesday 06 October 2004 10:14, Andreas Klauer wrote:
> Zviad O. Giorgadze wrote:
> > # Class for GLOBAL traffic
> > tc class add dev eth0 parent 1:1 classid 1:20 htb rate 115kbit ceil 1mbit
>
> Does different rate / ceil for the root class make sense?
No.
Same for the classes attached to the root qdisc.  They can not share 
bandwidth.  So your basi setup should be:
root htb qdisc
   htb class with ceil = rate = link bandwidth
      other classes

Stef

-- 
stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
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Re: Re: [LARTC] What is the reccomended minimum rate for leaf htb class foraccurate operation?

[Zviad O. Giorgadze]

>"Zviad O. Giorgadze" wrote:
>> # Put flow to corresponding classes
>> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.1 flowid 1:21
>> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.2 flowid 1:22
>> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.3 flowid 1:23
>> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.4 flowid 1:24
>> tc filter add dev eth0 protocol ip parent 1: u32 match ip dst 192.168.0.5 flowid 1:25
>
>If you are NATting, there is no 192.168.0.anything because the address
>has been NATted.

But checking via "tc -s -d class show dev eth0" shows that filter correctly recognizes packets and pust it into appropriate class.
NAT is performed before the eth0.

Zviad




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Re: Re: [LARTC] What is the reccomended minimum rate for leaf htb class for accurate operation?

[Zviad O. Giorgadze]

>> Does different rate / ceil for the root class make sense?
>No.
>Same for the classes attached to the root qdisc.  They can not share 
>bandwidth.  So your basi setup should be:
>root htb qdisc
>   htb class with ceil = rate = link bandwidth
>      other classes

So following script is reccomended?
 
tc qdisc add dev eth0 root handle 1: htb default 11 r2q 10

# Class corresponding external interface throughput (for 115kbit ADSL)
tc class add dev eth0 parent 1: classid 1:1 htb rate 115kbit ceil 115kbit

# Classes for PC-s
tc class add dev eth0 parent 1:1 classid 1:11 htb rate 55kbit ceil 115kbit prio 2
tc class add dev eth0 parent 1:1 classid 1:12 htb rate 48kbit ceil 115kbit prio 3
tc class add dev eth0 parent 1:1 classid 1:13 htb rate 12kbit ceil 115kbit prio 4
#End if script

What can I do if the same interface (eth0) is used for other purposes (internal traffic generated from local servers)?
If HTB class has the highest ceil set to 115kbit, how can I define other classes for example for internal traffic?

Zviad


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Re: [LARTC] What is the reccomended minimum rate for leaf htb classfor accurate operation?

[mjoachimiak]

> mjoachimiak@poczta.onet.pl wrote:
> > Your gues is right. To get HTB work correctly you must know rate
parameter
> > for your connection also known as CIR.
> > Coud you tell what minimum rate your clients have?
>
> My worst HTB class has rate&ceil 778bps.
>
> I guess the lower the rate, the less accurate the result. It can't be
> accurate, because the class already exceeds it's limit by sending just
> one single packet.
I agree. As far as I know average MTU is 1500bytes. I have rate
13kbit/8\x1625bytes so the limit should not be reached. Maybe there is
overhead on ppp link and with this overhead clients gets congested?
What do you think?
Any ideas?
> Maybe it's more accurate in the long run, but I don't have any
> statistics to prove that. Anyway, the traffic for that class is damn
> slow, and that's all I need to know. ;-)
>
> Andreas
>

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Re: [LARTC] What is the reccomended minimum rate for leaf htb classfor

[Andy Furniss]

mjoachimiak@poczta.onet.pl wrote:
> 
>>mjoachimiak@poczta.onet.pl wrote:
>>
>>>Your gues is right. To get HTB work correctly you must know rate
> 
> parameter
> 
>>>for your connection also known as CIR.
>>>Coud you tell what minimum rate your clients have?
>>
>>My worst HTB class has rate&ceil 778bps.
>>
>>I guess the lower the rate, the less accurate the result. It can't be
>>accurate, because the class already exceeds it's limit by sending just
>>one single packet.
> 
> I agree. As far as I know average MTU is 1500bytes. I have rate
> 13kbit/8\x1625bytes so the limit should not be reached. Maybe there is
> overhead on ppp link and with this overhead clients gets congested?
> What do you think?
> Any ideas?

Low rates seem OK for me. I don't think relating packet size to rate in 
kbit/sec is the right way to think about things.

A  class with a low rate will send a packet and then not be able to send 
again for an amount of time which is (pre)calculated from packet size 
and rate. The time may be > 1 second, so things work out in the end.


Andy.



> 
>>Maybe it's more accurate in the long run, but I don't have any
>>statistics to prove that. Anyway, the traffic for that class is damn
>>slow, and that's all I need to know. ;-)
>>
>>Andreas


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