Today we got questions about z/VSE running in a z/VM guest. One aspect was TCP/IP performance in z/VM guests.
You may improve your network performance with the z/VM queue-I/O assist (QDIO performance assist) for z/VM V=V guests, if the guest uses real adapters and real networking devices via the Queued Direct I/O (QDIO) facility. z/VSE exploits queue-IO assist for OSA Express (CHPID type OSD) and HiperSockets (CHPID type IQD) devices.
With the aid of the assist, I/O interruptions can be passed directly from the hardware to the... [More]