[LARTC] Tuning HTB

[LARTC] Tuning HTB

[Christian Volk]

Hi!

I'm trying to share a 64 kbits/s ISDN connection for FTP downloads and WWW. 
FTP should slow down WWW a little a possible. 

I tried HTB (with kernel 2.4.18) with the following (amongst other) settings:

  $TC qdisc add dev $IF root handle 1: htb default 20
 
  $TC class add dev $IF parent 1: classid 1:1 htb rate 64kbit burst 2k
 
  $TC class add dev $IF parent 1:1 classid 1:10 htb rate 63kbit ceil 64kbit 
burst 2k
  $TC class add dev $IF parent 1:1 classid 1:20 htb rate 1kbit ceil 64kbit 
prio 1

  $TC qdisc add dev $IF parent 1:10 handle 10: sfq perturb 10
  $TC qdisc add dev $IF parent 1:20 handle 20: sfq perturb 10
 
  FLT="$TC filter add dev $IF protocol ip parent 1:0"
  $FLT prio 1 u32 match ip sport 80 0xffff flowid 1:10

The packets pass through the respective classes. But FTP doesn't seem to be 
slowed down when WWW traffic starts. When doing http and ftp downloads at the 
same time, I expected the FTP side to slow down a lot, but during my tests 
the ftp download had more throughput than the http.

Any thoughts?

Thanks!

- Christian
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Re: [LARTC] Tuning HTB

[Stef Coene]

The setup is OK.  But you have to be sure you are the bottleneck and not the 
modem.  You can do this by lowering the maximium to 62 (or 63, just try some 
numbers).  That way you are slowing down the internet link, but YOU are 
controlling it :)

Stef


On Monday 15 April 2002 09:18, Christian Volk wrote:
> Hi!
>
> I'm trying to share a 64 kbits/s ISDN connection for FTP downloads and WWW.
> FTP should slow down WWW a little a possible.
>
> I tried HTB (with kernel 2.4.18) with the following (amongst other)
> settings:
>
>   $TC qdisc add dev $IF root handle 1: htb default 20
>
>   $TC class add dev $IF parent 1: classid 1:1 htb rate 64kbit burst 2k
>
>   $TC class add dev $IF parent 1:1 classid 1:10 htb rate 63kbit ceil 64kbit
> burst 2k
>   $TC class add dev $IF parent 1:1 classid 1:20 htb rate 1kbit ceil 64kbit
> prio 1
>
>   $TC qdisc add dev $IF parent 1:10 handle 10: sfq perturb 10
>   $TC qdisc add dev $IF parent 1:20 handle 20: sfq perturb 10
>
>   FLT="$TC filter add dev $IF protocol ip parent 1:0"
>   $FLT prio 1 u32 match ip sport 80 0xffff flowid 1:10
>
> The packets pass through the respective classes. But FTP doesn't seem to be
> slowed down when WWW traffic starts. When doing http and ftp downloads at
> the same time, I expected the FTP side to slow down a lot, but during my
> tests the ftp download had more throughput than the http.
>
> Any thoughts?
>
> Thanks!
>
> - Christian
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.openprojects.net
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Re: [LARTC] Tuning HTB

[Christian Volk]

On Monday 15 April 2002 09:27, Stef Coene wrote:

> The setup is OK.  But you have to be sure you are the bottleneck and not
> the modem.  You can do this by lowering the maximium to 62 (or 63, just try
> some numbers).  That way you are slowing down the internet link, but YOU
> are controlling it :)

Thanks!

Should the 1:1 rate be set to the interface rate (10 Mbit) or the connection 
rate (64kbit)?

I'm currently trying:
  1:1 htb rate 10 Mbit burst 12k
  1:10 htb rate 50kbit ceil 62kbit burst 2k
  1:20 htb rate 1kbit ceil 62kbit prio 1

Doesn't make much of a difference, ftp doesn't slow down enough to let the 
www page through without (or with little) delay.

I'll keep reading docs and shuffling numbers.

- Christian
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Re: [LARTC] Tuning HTB

[Stef Coene]

On Monday 15 April 2002 10:09, Christian Volk wrote:
> On Monday 15 April 2002 09:27, Stef Coene wrote:
> > The setup is OK.  But you have to be sure you are the bottleneck and not
> > the modem.  You can do this by lowering the maximium to 62 (or 63, just
> > try some numbers).  That way you are slowing down the internet link, but
> > YOU are controlling it :)
>
> Thanks!
>
> Should the 1:1 rate be set to the interface rate (10 Mbit) or the
> connection rate (64kbit)?
Connection rate

>
> I'm currently trying:
>   1:1 htb rate 10 Mbit burst 12k
>   1:10 htb rate 50kbit ceil 62kbit burst 2k
>   1:20 htb rate 1kbit ceil 62kbit prio 1
Try this :
1:1 htb rate 62kbit burst 12k
1:10 htb rate 50kbit ceil 62kbit burst 2k
1:20 htb rate 1kbit ceil 62kbit prio 1

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.openprojects.net
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Re: [LARTC] Tuning HTB

[Christian Volk]

On Monday 15 April 2002 10:55, you wrote:
> Try this :
> 1:1 htb rate 62kbit burst 12k
> 1:10 htb rate 50kbit ceil 62kbit burst 2k
> 1:20 htb rate 1kbit ceil 62kbit prio 1

Thanks for your help!

I'm now at :

1:1 htb rate 62Kbit burst 12Kb
1:10 htb rate 50Kbit ceil 62Kbit burst 7Kb
1:20 htb rate 1Kbit ceil 58Kbit

It works ok now. Lowering the ceil for :20 to 58Kbit made :10 a bit more 
responsive with the few space Kbits at hand.

It works best if the www data through :10 is also continuous, otherwise :20 
keeps the upper hand :-).

I'd like to see :20 stay throttled longer after a package was dequeued from 
:10, to give the next arriving :10 package a better chance.

I'm currently trying the dcache option, maybe it'll have an influence.

- Christian
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