This chapter provides guidance regarding the guest operating systems running in virtual machines. Guest Operating System General ConsiderationsThis section provides guidance regarding a number of general performance considerations in the guest operating system. Guest Operating System CPU ConsiderationsThis section addresses CPU considerations in the guest operating system. Guest Operating System Memory ConsiderationsThis section addresses memory considerations in the guest operating system. Guest Operating System Storage ConsiderationsThe virtual storage adapter presented to the guest operating system can influence storage performance, as can that device's driver, driver settings, and other factors within the guest. This section addresses those considerations. Guest Operating System Networking ConsiderationsThis section describes the various types of virtual network adapters, how to select one, and how to obtain the best performance from it.