Re: exact rate

Linux Advanced Routing and Traffic Control

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Thing is, it did not work for me, because of that exact reason. I had issues with it ignoring rates and in general not giving the lower latency I was going for. I really wish someone would update it. lartc.org is broken right now, but I believe the version up there is 3 years old.

- Jody

Salim wrote:

What confuses me is, how the popular HTB script 'wondershaper' works! The sum of its subclasses' rates is way over the parent's rate.

    ----- Original Message -----
    *From:* Jody Shumaker <mailto:jody.shumaker@xxxxxxxxx>
    *To:* Anton Glinkov <mailto:lartc@xxxxxx>
    *Cc:* lartc@xxxxxxxxxxxxxxx <mailto:lartc@xxxxxxxxxxxxxxx>
    *Sent:* Friday, December 23, 2005 4:22 AM
    *Subject:* Re:  exact rate

    Your subclass's combined rate's should never exceed your parent
    class's rate, and in this case your parent class is 5mbit, yet
    your subclasses have a combined guarenteed bandwidth of 6mbit.  In
    my setup,  the root classes rate is followed strictly.   With
    burst, it may go over temporarily but over say a minute's time,
    the bandwidth is pretty close to the set rate, usualy within
    ~0.4%. I'm unsure on what the behavior is when you allocate more
    bandwidth to subclasses than the root, but it may be the reason
    you're not seeing accurate results.

    - Jody

    On 12/14/05, *Anton Glinkov* <lartc@xxxxxx <mailto:lartc@xxxxxx>>
    wrote:

        Hello
        I am using htb (krenel 2.6.14.3 <http://2.6.14.3> + esfq patch
        from fatooh.org <http://fatooh.org>) to limit the
        bandwidth. But I want the absolute maximum rate to be for
        example 5Mbit
        and not to exceed it.

        here is the script:

        $tc qdisc add dev ${NETIF} root handle 1 htb r2q 4
        $tc class add dev ${NETIF} parent 1: classid 1:21 htb rate
        5Mbit ceil 5Mbit
        $tc class add dev ${NETIF} parent 1:21 classid 1:101 htb rate
        2Mbit ceil
        5Mbit prio 1
        $tc class add dev ${NETIF} parent 1:21 classid 1:102 htb rate
        1Mbit ceil
        5Mbit prio 2
        $tc class add dev ${NETIF} parent 1:21 classid 1:103 htb rate
        3Mbit ceil
        5Mbit prio 3

        when I don't specify burst the flow always exceeds 5Mbit
        when I try to play with it (the burst) for example turning it
        off completely
        burst 0 cburst 0 for parent and children classes the rate
        falls ot 2-3 Mbits

        removing the esfq qdiscs doesn't change anything...

        I want exact rate of 5Mbit for the parent class and no more?

        any suggestions are welcome :)

        --
        Anton Glinkov
        network administrator


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