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Performance Improvements

Large Enhancements

With the change to continuous delivery, IBM has shipped most of the recent new z/VM function as PTFs to z/VM 7.2 instead of waiting for a release boundary. We evaluated some of those PTFs and wrote articles about them. For more information, refer to our z/VM 7.2 page.

Some z/VM 7.2 PTFs providing performance or capacity improvement were not evaluated for this report. Those were:

VM66201: Allow VM Data Space use in Z/Architecture.

VM66386: VARY Command Performance Improvements (also apply VM66438)

VM66421: Allow HyperPAV 1-END Minidisks

VM66430: Add DISTILL Option to Dumpload

VM66450: Non-fullpack Minidisk z/HPF I/O Support

VM66456: Incorrect Paging Device Balancing

Small Enhancements

In our considerations chapter we mentioned some changes clients might like to consider before they migrate to z/VM 7.3. For details, refer to that chapter.

Service Since z/VM 7.2

z/VM 7.3 contains a number of performance-related repairs that were first shipped as service to earlier releases. Because IBM refreshes this report only occasionally, IBM has not yet had a chance to mention these PTFs.

VM66471: D6 R24 Monitor Record Shows Data For Only One Path

VM66501: Performance Toolkit Divide Exception at FCXPRC+30EC

VM66543: Perfkit FCX328 Panel Service Inuse Column In Error

Miscellaneous Repairs

IBM continually improves z/VM in response to customer-reported or IBM-reported defects or suggestions. In z/VM 7.3 the following small improvements or repairs are notable:

FCX127 URESP and FCX129 UTRANS show wrong values with FC UCLASS: The wrong values are repaired.

Perfkit takes a divide exception: The reason for the exception was repaired.

Perfkit FCX100 CPU rows missing: The reason for the missing rows was repaired.

Perfkit support for z/XC virtual machines: Perfkit now displays "z/XC" in appropriate spots.

Perfkit FCX301 DSVBKACT is missing the master-Only DV: The report has been corrected.

Perfkit FCX108, FCX168, FCX329 are missing EDEVs: The reports have been corrected.

Perfkit FCX249 and FCX250 use wrong field for percent connect: The reports have been corrected.

Perfkit FCX132 UCOMM takes a program check: The reason for the program check has been corrected.

z/VM TCP/IP SSL did not use crypto adapters: The reason was found and repaired.

D9 R3 MRISFILC is missing certain error codes: The LDVREASON and LDVERROR codes were added.

D6 R24 MRIODSZI Has Many Errors: Many fields in D6 R24 MRIODSZI are repaired.

D0 R10 MRSYTSCG comments need help: The comments on SRMABSDL and SRMRELDL are repaired.

D0 R10 MRSYTSCG comments need help: The comments on SRMABSDL and SRMRELDL are repaired.

Several Monitor records are missing definitions of EDEVTYPE bits: Comments in MRIODDEV, MRIODVON, and MRMTRDEV comments were improved.

D6 R1 MRIODVON is missing EDEVTABL: The missing field was added.

D2 R13 MRSCLALL and D2 R14 MRSCLDLL are missing VMTODLM and VMTODIL: The missing fields were added.

D0 R20 MRSYTEPM is missing CMGP: The missing field was added.

D1 R6 MRMTRDEV RDEVMEXT comment is unclear: The comment was improved.

D5 R9 MRPRCAPM timings unclear: The timings were corrected.

D0 R16 MRSYTCUM and D0 R17 MRSYTCUP topology comments unclear: The comments were corrected.

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