Jan, it appears the monitor is trying to tell you that you have a low "capture ratio". Searching for that term should give you a good understanding of what the message really means, and in a lot of good advice, e.g. in the "Effective zSeries Performance Monitoring Using Resource Measurement Facility" publication. (IMHO the term "overhead" is misleading, 'management time' would be more accurate). If you believe there might be a problem you may want to start with verifying LPAR configuration and IEAOPTxx settings (any obscure timing parameters? Anything violating recommendations?). You could also verify that the capture ratio is indeed low using SMF70/72 data.
Phantom weight is irrelevant in this context. It is only a vehicle to tell PR/SM how to cap the partition. The fact that the LPAR *is* capped at that time (to what extent?) may very well be relevant, though: More work, longer work queues... CPUMF counters won't help you diagnosing anything. CPUMF sampling could help -theoretically- but the data may be very hard to evaluate. Horst Sinram - IBM z/OS Workload Management ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
