September 2002
Intermediate to advanced
332 pages
11h 1m
English
Content preview from IBM eServer zSeries 900 Technical Guide
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28 IBM eServer zSeries 900 Technical Guide
2.2.5 Processing Unit assignments
Processing Unit (PU) assignments are made at the Initial Microcode Load (IML) time during a
Power-On-Reset (POR).
CPs are assigned from the lowest numbered PUs, alternating across the two clusters to
equalize load in each cluster and maximize throughput.
SAPs are assigned from the highest numbered PUs. Optional SAPs are kept on one
cluster to minimize impact of SAP activity on L2 cache.
IFLs and ICFs are assigned from the remaining highest numbered PUs, and are kept on
one cluster to minimize impact of IFL/ICF activity on the L2 cache.
The two PUs associated with the alternate path from each CE are the last to be assigned
as CPs, SAPs, IFLs, or ICFs.
2.2.6 Processing ...
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