Re: Ceil Rate

Linux Advanced Routing and Traffic Control

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I thought that the default ceil was the same as the rate, or does that only
apply to the root class?

Thanks for the info.

On Fri Sep 30, 2005 at 06:29:52PM -0400, Jody Shumaker wrote:
> You didn't set a ceil for 1:10, you only set a rate. when no ceil is
> specified, a subclass will borrow past its rate max if it can.
> 
> You should use:
> 
> tc class add dev eth1 parent 1:1 classid 1:10 htb rate 64kbit ceil 64kbit
> quantum 1501
> 
> And then it would use 64kbit as a hard cap, only going past it for short
> bursts when trying to maintain 64kbit as the average (cburst paramater can
> control this, but shouldn't be neccasary).
> 
> - Jody
> 
> On 9/30/05, anderson@xxxxxxxxxxxx <anderson@xxxxxxxxxxxx> wrote:
> >
> >
> > tc class add dev eth1 parent 1:1 classid 1:10 htb rate 64kbit quantum 1501
> >
> 
> 
> The problem is I often find the rate exceeding the ceil which is 64kbit for
> > 1:10 when I ran this
> > command:
> >
> > tc -s show class dev eth1
> >
> > I'm also using a script that captures the output of the above command and
> > feeds it to rrdtool to plot a graph of the usage and it also shows that
> > the
> > bandwidth being utilised exceeds 64kbit.
> >
> > How can ensure that this doesn't happen? Where did I go wrong with my
> > config?
> >
> > Any help would be appreciated.
> >
> >
> > Thanks.
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> >

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