- mmap for mmap'ed io, splice for using splice/vmsplice,
- or sgio for direct SG_IO io. The latter only works on
- Linux on SCSI (or SCSI-like devices, such as
- usb-storage or sata/libata driven) devices.
+ mmap for mmap'ed io, syslet-rw for syslet driven
+ read/write, splice for using splice/vmsplice,
+ sgio for direct SG_IO io, or net for network io. sgio
+ only works on Linux on SCSI (or SCSI-like devices,
+ such as usb-storage or sata/libata driven) devices.
+ Fio also has a null io engine, which is mainly used
+ for testing fio itself.