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2 – InfiniPath Cluster Administration
Configuration and Startup
2-4 IB6054601-00 D
Q
This breaks down to a memory footprint of 331MB per node, as follows:
2.4
Configuration and Startup
2.4.1
BIOS Settings
A properly configured BIOS is required. The BIOS settings, which are stored in
non-volatile memory, contain certain parameters characterizing the system,. These
parameters may include date and time, configuration settings, and information about
the installed hardware.
There are currently two issues concerning BIOS settings that you need to be aware
of:
■ ACPI needs to be enabled
■ MTRR mapping needs to be set to “Discrete”
MTRR (Memory Type Range Registers) is used by the InfiniPath driver to enable
write combining to the InfiniPath on-chip transmit buffers. This improves write
bandwidth to the InfiniPath chip by writing multiple words in a single bus transaction
(typically 64). This applies only to x86_64 systems.
However, some BIOSes don’t have the MTRR mapping option. It may be referred
to in a different way, dependent upon chipset, vendor, BIOS, or other factors. For
example, it is sometimes referred to as "32 bit memory hole", which should be
enabled.
If there is no setting for MTRR mapping or 32 bit memory hole, please contact your
system or motherboard vendor and inquire as to how write combining may be
enabled.
ACPI and MTRR mapping issues are discussed in greater detail in the
Troubleshooting section of the InfiniPath User Guide.
NOTE: BIOS settings on IBM Blade Center H (Power) systems do not need
adjustment.
Table 2-2. Memory Footprint, 331 MB per Node
Component Footprint (in MB) Breakdown
Driver 9 Per node
MPI 316 4*71 MB (MPI per process)
+ 32 MB (shared memory
per node)
OpenFabrics 6 6 MB + 200 KB per node