https://www.manualslib.com/manual/512667/Qlogic-8100-Series.html?page=276
Operation Mode (ZIO)
The Operation Mode (ZIO) parameter specifies the reduced interrupt operation modes. ZIO modes allow the posting of multiple command completions in a single interrupt. Values below describe the Operation Mode parameter values in detail.
0 - Disables ZIO mode.
5 - Enables ZIO mode 5. DMA transfers response queue entries into the response queue. No interrupt is generated unless the Interrupt Delay Timer updates the Response Queue-Out Pointer register.
6 - Enables ZIO mode 6. DMA transfers response queue entries into the response queue and generates an interrupt when the firmware has no active exchanges (even if the interrupt delay timer has not expired).
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