Best Practices for Optimizing Device Drivers (Windows CE 5.0)

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You may need to optimize your device driver for size or speed.

The following list shows best practices for optimizing device drivers:

  • Conserve RAM usage by specifying the XXX_PowerUp (Device Manager) and XXX_PowerDown (Device Manager) entry points as non-pageable, and specify the rest of the entry points as pageable. Some components are non-pageable because ActivateDeviceEx loaded them with LoadDriver to load the driver DLL in non-pageable RAM. Device drivers get loaded as non-pageable because their XXX_PowerUp and XXX_PowerDown functions cannot be pageable because they are called in a critical context.

    Remove unused XXX_PowerUp and XXX_PowerDown functions from .def files and add DEVFLAGS_LOADLIBRARY flag to the Flags registry keys for the driver. If drivers do not do anything in their XXX_PowerUp and XXX_PowerDown functions, remove these functions and enable the driver to receive power notifications.

See Also

Notification Interface | Stream Interface Drivers

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