The customers have a containerd NRI plugin that uses the irqbalance API to dynamically ban irqs. When they reache the irqbalance API limit our NRI plugin error out and they can't launch new containers.

The irqbalance API uses a fixed buffer that is way too small, truncating the commands.

The customer sent a fix upstream that got accepted, and they need it backported to RHEL 9.5:

https://github.com/Irqbalance/irqbalance/commit/105b155545e00560a55d34b160324910586ae74c

Commit 105b155

Check API command length, allow up to 16384
When using the API to ban cpus or irqs, the command can easily be longer
than 500, so increase the buffer to 16384, which fits ~3250 cpus
or irqs, and add a check to log and exit if it is still not enough.

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>