QIO Configuration and Management Manual

Configuring the QIO Subsystem
QIO Configuration and Management Manual—424717-008
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Setting the Size of QIO Memory
The last valid flat segment address is 0x4e000000-1. If the base address specified
causes the end address of the QIO segment to exceed this boundary, the segment
size is automatically reduced to fit. This does not take into account other flat segment
requirements.
To change the base address, specify the following attribute in the configuration file:
BaseAddress starting address
where the valid starting addresses are 0x10000000 to 0x4c000000.
The base address increases in 32 MB increments. The default starting address is
0x20000000.
Setting the Size of QIO Memory
If the flat memory space reserved for program use needs more space, and your QIO
shared segment memory is less than the default size of 512 MB, you can reduce the
size of the QIO segment. This change creates more space for programs in flat
memory, and if you also change the starting base address, you can provide more
space for the process heap and process globals.
If you need no more than 128 MB of QIO memory space on NonStop S-series servers
or 256 MB on Integrity NonStop NS-series servers, move the QIO segment to system
space.
Note. You can only change the base address in the flat segment, not in the global privileged space.
Note. For H06.22/J06.11 and all subsequent RVUs, the maximum QIO segment size in
system space for Integrity NonStop NS-series is increased to 512 MB, while the default size
remains 256 MB.