z/VSE 5.1: There is a new performance option for TCP/IP traffic.
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The new configuration option could improve TCP/IP performance especially for z/VSE systems
connected to Linux on System z using communication over HiperSockets.
This enhancement was delivered end of 2012 as APAR DY47
using the new macro QDIOBUFF (and skeleton SKOSACFG). The number of QDIO buffers
can be configured in multiples of 8 in the range from 8 to 120.
QDIO buffers are allocated in 31 bit partition GETVIS space, that is you may need to increase
your partition allocation, if you define more buffers - and the buffers are to be PFIXed.
Therefore the Job Control SETPFIX command need to be adapted.
More QDIO input buffers may improve performance when the number of buffers e.g.
for Linux on system z and z/VSE is unbalanced. More buffers may reduce or avoid resends.
The configuration of QDIO input buffers is available for HiperSockets and OSA Express (CHPID OSD).