[libvirt-users] How do you set real time bandwidth for a container?
When I create a VM using libvirt, the VM comes up the path /sys/fs/cgroup/cpu/cpu.rt_runtime_us set to something like 1000000. When I create a container however, the path /sys/fs/cgroup/cpu/cpu.rt_runtime_us is 0. This prevents my containers from being able to run any real time applications. I have to explicitly echo a value into this field in order to give the container some real time bandwidth and allow it to run real time processes. Is it possible to define this in a container's XML config? Or is there another method I should be using to enable real time capability in a container? Peter
On 29.10.2016 01:01, Peter Steele wrote:
When I create a VM using libvirt, the VM comes up the path /sys/fs/cgroup/cpu/cpu.rt_runtime_us set to something like 1000000. When I create a container however, the path /sys/fs/cgroup/cpu/cpu.rt_runtime_us is 0. This prevents my containers from being able to run any real time applications. I have to explicitly echo a value into this field in order to give the container some real time bandwidth and allow it to run real time processes.
This is some weird kernel default. I mean libvirt does not set that value anywhere.
Is it possible to define this in a container's XML config? Or is there another method I should be using to enable real time capability in a container?
No, currently there's no way to provide that in XML config. However, you can create a hook script that is executed whenever domain is being started and that script can set the proper value for you. Michal
participants (2)
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Michal Privoznik -
Peter Steele