The Integrated Facility for Linux (IFL) is a specialty engine processor on IBM System z mainframe servers that is dedicated to Linux workloads. Operational efforts, software costs, energy use and hardware footprint are reduced when Linux is deployed on IFL rather than general-purpose processors.
The IFL on zEnterprise is also fast enough to host more virtual servers per processor core than other server platforms. It can host up to 60 virtual servers on a zEC12 system.
IBM offers two other specialty engines: IBM System z Integrated Information Processor (zIIP) and IBM System z Application Assist Processor (zAAP). The zIIP helps centralize data on the mainframe and the zAAP processor runs Web-based applications and service-oriented architectures.