Re: How can I test my tc script?

[Optimum Wireless Services <wilson@optimumwireless.com>]

On Sat, 2011-02-05 at 12:35 +0000, Andrew Beverley wrote:
> On Fri, 2011-02-04 at 22:44 -0400, Optimum Wireless Services wrote:
> > On Thu, 2011-02-03 at 19:38 +0000, Andrew Beverley wrote:
> > > On Wed, 2011-02-02 at 22:17 -0400, Optimum Wireless Services wrote:
> > > > I would like to know how can I run some sort of benchmark test on a
> > > > network that would simulate 10,20,50,100 users connected to see if my gw
> > > > is handling the traffic well.
> > > > 
> > > 
> > > I suggest using tc-viewer to see what your qdisc is actually doing
> > > during peak use:
> > > 
> > > tc-viewer --iface=eth1 --zero --counter=1 --unit=kbit
> > > 
> > > > Here's a snip of what the script looks like:
> > > > 
> > > > ################ 
> > > > Now Download interface
> > > > 
> > > > $tc qdisc del dev eth1 root
> > > > $tc qdisc add dev eth1 root handle 2: htb r2q 1
> > > > 
> > > > $tc class add dev eth1 parent 2:0  classid 2:1 htb rate 15500kbit ceil
> > > > 15525kbit
> > > > 
> > > 
> > > Does the sum of all the leaf classes below add up to the root rate
> > > above? From the HTB manual: "The rate supplied for a parent should be
> > > the sum of the rates of its children."
> > > 
> > 
> > Hi Andy.
> > 
> > The sum of my users' classes or leafs rate would not be equal to the
> > parent's. They will never add up to the total root class since I will be
> > adding rules every once in a while so, if my root total BW is 15Mbps and
> > I have 100 users at 512kbps each then, that could be a problem. 
> > 
> 
> Hmmm, well HTB is known to misbehave if they don't all add up correctly,
> which could explain your problems. Why don't you *try* it with them all
> adding up correctly, just temporarily for your current number of users,
> to see if this is the problem.
> 

Just wondering, I have a total of 15Mbps for our total bandwidth. If I
devide that into 512kbps then I can only have about 29 users at that
rate. Don't know if I'm doing the math correctly but, how many users
should a 15Mbps line should serve without problems?

> > Is there something else to do instead?
> > 
> 
> You could have a look at another classful qdisc such as HFSC or CBQ.
> However, I've never played with them, so they may not be of any more
> help.
> 
> Andy
> 
>