1. A method of managing power consumption of a computer, the computer comprising a computer processor, the method comprising: dynamically during operation of the computer, setting, by an in-band power manager in dependence upon performance metrics of the computer processor, a current performance state (‘p-state’) of the computer processor; and providing, by the in-band power manager to an out-of-band power manager, the current p-state of the computer processor; wherein: the method further comprises setting, by the out-of-band power manager, in the in-band power manager, a minimum p-state; and setting, by the in-band power manager, a current p-state of the computer processor further comprises setting the current p-state of the computer processor in dependence upon the minimum p-state.