The queued direct I/O (QDIO) accelerator function operates at the
Data Link Control (DLC) level and positively affects the performance
of IP packets routed between QDIO and HiperSockets network interfaces.
When the QDIO Accelerator is enabled for an IPv4 address space, the
number of transmitted bytes routed outbound using internal queued
direct I/O (iQDIO) routing or QDIO Accelerator should increment steadily.
z/OS Communication Server supports not only acceleration of QDIO to HiperSockets
(Q to I) and of HiperSockets to QDIO (I to Q), but also acceleration
off QDIO to QDIO (Q to Q) and off HiperSockets to HiperSockets (I to I).
If QDIO Accelerator is active, this situation indicates that
the QDIO Accelerator routes are not being used. To verify the configuration,
see IBM z/OS Communications Server: IP Configuration
Reference for details on the QDIOACCELERATOR parameter. It may
be the traffic is "bursty" and therefore it is normal to not accelerate
in an interval.
This is a warning situation.
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