Installation guide

segmentation
Enables or disables shared page tables. The default
is 1 (enabled).
swapbuffers
Specifies the maximum number of swap buffers
that are available for swap I/O. The default is 128.
ubcbuffers
Specifies the minimum number of buffers that the
unified buffer cache can contain. The default is 256.
vpagemax
Specifies the maximum vpage for user map, or the
maximum number of individually protected pages.
The default is 16384.
zone_size
Specifies the amount of kernel virtual address space
that is available for many of the system’s dynamic
data structures. The default is 67108864, which is
sufficient for most system environments. If the
system panics and issues a message indicating that
the zone_size value is too small to support the
current workload, increase the parameter value
until it is sufficient for the workload.
5.6.2 System Definition Keyword
The config keyword defines the kernel configuration in terms of the
location of the root file system and the dump and swap areas. The
recommended config keyword entry selects the a partition of the disk
from which the kernel was booted as the root file system. For example:
config vmunix swap generic
You can use the swapon command to allocate swap areas from the
/etc/fstab file. By default, the system assigns the dump area to the
same partition as the first swap area found in the /etc/fstab file. You
should use the default dump area; however, you can override the default by
adding the dumps keyword to the config specification.
For example, to dump to the b partition of an RZ-class disk configured as
unit 1, add the following line to the configuration file:
config vmunix root on rz1a dumps on rz1b
You must also list rz1b as a swap device in the /etc/fstab file, as shown:
Configuring the Kernel 5–47