Andrew Donnellan [off-list ref] writes:

On Mon, 2023-03-06 at 15:33 -0600, Nathan Lynch via B4 Relay wrote:

quoted

* We can expect performance improvements for existing sys_rtas()
  users, not only because of overall reduction in the number of
system
  calls issued, but also due to the better handling of -2/990x in the
  kernel. For example, librtas still sleeps for 1ms on -2, which is
  completely unnecessary.

Would be good to see this fixed on the librtas side.

Filed an issue: https://github.com/ibm-power-utilities/librtas/issues/30