Processor cache affinity parameters

Parameter	Dflt	Min	Max
LOAD_BAL_FREQ	100	1	10000
MAXCACHEWARM	30	0	5000
MAXIMBALANCE	5	0	100
OVSTACK_PREEMPT	0	0	1
OVSTACK_SIZE	20	1	0x1000

LOAD_BAL_FREQ

The frequency in ticks with which the lengths of the per-processor run queues are examined to check that the differences exceed MAXIMBALANCE.

MAXCACHEWARM

Maximum number of ticks after which the cache is assumed to have turned cold.

MAXIMBALANCE

The maximum difference between two local run queues that is allowed. Once this maximum is exceeded, load balancing requirements will dictate putting affinitized LWPs on global run queue.

OVSTACK_PREEMPT

A boolean value that controls whether preemption is enabled while a kernel LWP's (lightweight process's) stack is using the extension page. When this tunable is set to ``0'' (the default), the kernel will not preempt an LWP whose stack extends into the extension page. When set to ``1'', such preemption is enabled, thereby providing enhanced real time response. Enabling this feature can cause increased use of the stack overflow memory, and therefore, an increased value of OVSTACK_SIZE is recommended. OVSTACK_PREEMPT and OVSTACK_SIZE are important when you use drivers that use more stack space and when you run real-time applications.

OVSTACK_SIZE

The quantity of memory (in kilobytes) set aside to handle stack overflow conditions. OVSTACK_PREEMPT and OVSTACK_SIZE are important when you use drivers that use more stack space and when you run real-time applications.