[LARTC] Service Loading

[LARTC] Service Loading

[Steve]

Hi,

My apologies if I've just missed the point here (I have scanned the
archives).

I have a server with an FTP service on one IP, a HTTP service on the
other. I wish to make all the upstream bandwidth available for FTP
unless an HTTP request arrives - at which point I want to throttle FTP
back and give the majority of the bandwidth to the HTTP session.

In order to test this I have the following script (I'm sure I've just
missed the point somewhere along the line):-

tc qdisc del dev ppp0 root
tc qdisc add dev ppp0 root handle 10: cbq bandwidth 10Mbit avpkt 1000

tc class add dev ppp0 parent 10:0 classid 10:1 cbq bandwidth 10Mbit rate
\
128kbit allot 1514 prio 1 maxburst 20 avpkt 1000

tc class add dev ppp0 parent 10:1 classid 10:2 cbq bandwidth 10Mbit rate
\
10kbit allot 1514 prio 8 maxburst 20 avpkt 1000

tc filter add dev ppp0 parent 10:0 protocol ip pref 60 u32 \
match ip dst 0.0.0.0/0  flowid 10:1

tc filter add dev ppp0 parent 10:0 protocol ip pref 50 u32 \
match ip src my.ftp.server flowid 10:2

As I understand it 10:2 is a child of 10:1. As I have set the priority
of 10:2 to 8 and the priority of 10:1 to 1 then a request meeting 10:1
will have a much higher priority and the bandwidth will all be assigned
to the 10:1 session and not loan any bandwidth to 10:1.

In reality this doesnt work! If I make 10:2 bounded then it throttles
back to 10kbs. If I remove bounded it borrows bandwidth from its parent
- even at the cost of a 10:1 session.

Comments as to :-

a) why this doesn't work
b) whether this is the best way of handling this problem

....will be greatly appreciated!

With thanks,

Steve.


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Re: [LARTC] Service Loading

[Stef Coene]

On Sunday 07 October 2001 12:10, Steve wrote:
> Hi,
>
> My apologies if I've just missed the point here (I have scanned the
> archives).
I missed a small point.  I will try to explain.  When you provide no weight 
parameter and you use no extraq qdiscs and you put on each class a filter, 
class 10:1 and 10:2 will get each 50% of the bandwidth.  Don't ask me why.

Give each class a weight parameter, create an extra class attached to the 
root qdisc, attach the 2 other class to this class and point the filters 
direcly to each class.  You find a lot of examples and more explanation on 
docum.org.

Stef

-- 

stef.coene@docum.org        stef.coene@belgacom.net
More QOS info : http://docum.org/
Title : "Using Linux as bandwidth manager"

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