Tuesday, July 2, 2013

POWER7 dispatch differences from POWER6 and POWER5

Optimizing for POWER7 & AIX What's New
Q4 2012
From Page 17:
In POWER5 and POWER6, the primary and secondary SMT threads are loaded to ~80% utilization before another Virtual Processor is unfolded
In POWER7 all of the primary threads (defined by how many VPs are available) are loaded to at least ~50% utilization before the secondary threads are used.  Once the secondary threads are loaded, only then will the tertiary threads be dispatched.

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