Test results

The performance impact of the APAR VM65586 and the HiperDispatch polarization modes on middleware performance are described in this topic.

z/VM 6.3 and the z13 exploitation SPE APAR VM65586
When starting analyzing the various waits in relation with dispatching virtual CPUs, we found that a beneficial side effect of the APAR VM65586 - which is intended to enable the Simultaneous Multithreading (SMT) feature for z/VM® 6.3 on IBM® z13 - is also of interest for non-SMT z Systems machines.
SRM polarization and guest CPU waits
The initial reason for that study was the observation in regard to CPU waits reported from the USTAT report for the used guests.

Parent topic: IBM z/VM 6.3 HiperDispatch - Polarization Modes and Middleware Performance