ddi_msix_alloc_limit

Description

This parameter, available on x86 systems only, controls the number of Extended Message Signaled Interrupts (MSI-X) that a device instance can allocate. Due to an existing system limitation, the default value is 2. You can increase the number of MSI-X interrupts that a device instance can allocate by increasing the value of this parameter. This parameter can be set either by editing the /etc/system file or by setting it with mdb before the device driver attach occurs.

Data Type

Signed integer

Default

2

Range

1 to 16

Dynamic?

Yes

Validation

None

When to Change

To increase the number of MSI-X interrupts that a device instance can allocate. However, if you increase the number of MSI-X interrupts that a network device instance can allocate, adequate interrupts might not be available to satisfy all allocation requests. If this happens, some devices might stop functioning or the system might fail to boot. Reduce the value or remove the parameter in this case.

Commitment Level

Unstable