Re: [Xen-users] [Xen-devel] Q&A question: Dynamic Network Throttling?

[Russ Pavlicek <russell.pavlicek@xxxxxxxxxxxxxx>]

Simon,

Splendid!  Thank you!

I've added your replies to the Q&A section on XenProject.org.

Russ

On Mon, May 5, 2014 at 1:12 PM, Simon Hobson <linux@xxxxxxxxxxxxxxxx> wrote:
> I meant to add ...
>
> Basic config. Configure a tree of HTB classes like this :
>
> First configure a root attached to the interface :
> tc class add dev ethext parent 1: classid 1:1 htb rate $OutSpeed burst 20k 
> cburst 20k
>
> In my setup, I have multiple groups of classes, so I have a brach for each 
> group :
> tc class add dev ethext parent 1:1 classid 1:10 htb rate 6144kbit ceil 
> $OutCeilDef burst 16k cburst 16k prio 1
> You can leave this out and just make the parent of the following classes id 1
>
> Then within this group I have a set of leafs :
> tc class add dev ethext parent 1:10 classid 1:11 htb rate 1024kbit ceil 
> $OutCeilDef burst 12k cburst 12k prio 1
> tc class add dev ethext parent 1:10 classid 1:12 htb rate 4096kbit ceil 
> $OutCeilDef burst 12k cburst 12k prio 2
> tc class add dev ethext parent 1:10 classid 1:13 htb rate 512kbit ceil 
> $OutCeilDef burst 12k cburst 12k prio 3
> tc class add dev ethext parent 1:10 classid 1:14 htb rate 512kbit ceil 
> 6144kbit burst 12k cburst 12k prio 4
>
> Then within each leaf, we run a fair queuing discipline :
> tc qdisc add dev ethext parent 1:11 handle 11: sfq perturb 10
> tc qdisc add dev ethext parent 1:12 handle 12: sfq perturb 10
> tc qdisc add dev ethext parent 1:13 handle 13: sfq perturb 10
> tc qdisc add dev ethext parent 1:14 handle 14: sfq perturb 10
>
> For each class, you set the rate to be what you want to be available under 
> "full load", and ceiling to what you want any class to be able to go to when 
> other classes aren't using their full allocation. Just make sure that for 
> each branch in the tree, the sum of the rates of the children does not exceed 
> that of the parent - ie it's no good throttling a group of (say) 4 guests to 
> 10Mbps each, if the parent then throttles to (say) 30Mbps. The parent will 
> then throttle separately, meaning that the individual child queues won't be 
> able to work properly.
>

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