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Dedicated Memory is a configurable feature that can improve the performance of some software when running on advanced Intel processors: Pentium and Pentium Pro processors support this feature. If you configure dedicated memory on a processor that does not support this feature, it will have no effect. Dedicated Memory can improve performance of applications that create large shared memory segments using the shared memory primitives described in shmget(2), shmctl(2), and shmop(2).
The DEDICATED_MEMORY parameter specifies the size, in 4k pages, of memory which is to be reserved at startup time and dedicated for special purposes. Such purposes include shared memory segments which are 1MB or larger, shared memory segments which use fine-grained affinity (FGA shm), and dynamically mapped shared memory (dshm) segments. You must set DEDICATED_MEMORY in order to dedicate any amount of system memory.
To configure the Dedicated Memory feature:
Depending on the applications and workload involved, you might consider using UVIRT_EXTENSION as an alternative to DSHM.