Power Capping - Hitachi Compute Blade 2000 User Manual

Power capping

With the power capping function, too small values for the power capping reduces the CPU
performance, which might cause the OS performance on the LPAR to slow down. Conduct
tests adequately and then configure a proper value.
Processor capping
With LPAR manager firmware version 58-5X/78-5X or earlier, power consumption by an
LPAR might not be controlled as the setting value regardless of that processor capping for
the LPAR is shown as Enabled in the configuration information.
If it has occurred, reconfigure the processor capping to Enabled.
Assigning processors when SMT
enabled
When SMT is Enabled in the EFI setting, the entire system efficiency will be

improved by up to 20%.
To avoid interference between LPARs, which changes LPAR performance

depending on the workload status of another LPAR, assign processors following
the description below:
Assign an even number of processors to an LPAR.

Although you can select processors to use on the Logical Processor

Configuration screen when assigning dedicated processors, do not assign any
thread in the same core to different LPARs.
# Thread0
Dedicated
1
(the same LPAR)
Dedicated
2
(different LPARs)
Dedicated
3
Shared
4
Shared
5
Thread1 Interference Recommended
Dedicated
None Dedicated
Dedicated
Interfered Not
recommended
Not
Shared
Interfered
recommended
Not
Dedicated
Interfered
recommended
Shared
Interfered Shared
1384
Remarks
Automatically
determined when an
even number of
processors are
assigned.
Automatically
determined when an
odd number of
processors are
assigned.
The status is "Shared"
The status is "Shared"
Assigning an even or
odd number of
processors is available.