You might enhance the managed system
performance by manually
or automatically changing the logical-memory block size.
The system kernel uses the memory block size
to read
and write files. By default, the logical-memory block size is set
to Automatic. This setting allows the system
to set the logical-memory block size based on the physical memory
available. You can also manually change the logical-memory block size.
To
select a reasonable logical block size for your system, consider both
the performance desired and the physical memory size. Use the following
guidelines when selecting logical block sizes:
- On systems
with a small amount of memory installed (2 GB or less),
a large logical-memory block size results in the firmware consuming
an excessive amount of memory. Firmware must consume at least 1 logical-memory
block. As a general rule, select the logical-memory block size to
be no greater than 1/8th the size of the system's physical memory.
- On systems with a large amount of memory installed, small logical-memory
block sizes result in a large number of logical-memory blocks. Because
each logical-memory block must be managed during boot, a large number
of logical-memory blocks can cause boot performance problems. As a
general rule, limit the number of logical-memory blocks to 8 K or
less.
Note: The logical-memory block size can be changed
at run time,
but the change does not take effect until the system is restarted.
To
perform this operation, you must have one of the following authority
levels:
- Administrator
- Authorized service provider
To configure logical-memory block size, perform the following
steps:
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