In the inventory, some variables are used to manage the RT (see Cluster installation section).

Interrupt Requests

The irqmask define the environment variable IRQBALANCE_BANNED_CPUS. It sould ignore some CPU and never assign interrupts (more details here, the irqbalance manual).

The workqueuemask is his negation. There are no function to get it to avoid maintain an algorithm.

These variables is a hex mask without "0x" where the first CPU is the least signifiant bit.

Kernel configuration

The cluster is installed with a real-time kernel on each node. It must execute orders without delay. So, some CPUs should be isolated from the scheduler kernel with isolcpus kernel parameter.