[libvirt-users] Does lxc support cputune/vcpusched option

[Peter Steele]

I should add that I am running under CentOS 7.3 with kernel version 
3.10.0-514.6.2.

On 04/27/2017 01:40 PM, Peter Steele wrote:
> I need a container that supports real time threads. According to the 
> documentation, I can do something like this:
>
> <domain type='lxc'>
>   <name>test1</name>
>   <uuid>e7446f55-3d59-4af0-90b2-d1498ac4370d</uuid>
> ...
>   <vcpu placement='auto'>2</vcpu>
>   <cputune>
>     <vcpusched vcpus='0-1' scheduler='fifo' priority='1'/>
>   </cputune>
> ...
> </domain>
>
> The document describes the vcpusched element as follows:
>
> The optional |vcpusched| elements specifies the scheduler type (values 
> |batch|, |idle|, |fifo|, |rr|) for particular vCPU/IOThread threads 
> (based on |vcpus| and |iothreads|, leaving out |vcpus|/|iothreads| 
> sets the default). Valid |vcpus| values start at 0 through one less 
> than the number of vCPU's defined for the domain. Valid |iothreads| 
> values are described in the |iothreadids| |description| 
> <https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation>. 
> If no |iothreadids| are defined, then libvirt numbers IOThreads from 1 
> to the number of |iothreads| available for the domain. For real-time 
> schedulers (|fifo|, |rr|), priority must be specified as well (and is 
> ignored for non-real-time ones). The value range for the priority 
> depends on the host kernel (usually 1-99).
>
> So I *think* my xml is correct for this, but it doesn't seem to 
> work--I still can't create real time threads in my container. Am I 
> missing another configuration step somewhere?
>
> Peter
>

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