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Oracle® Solaris 11.4 Tunable Parameters Reference Manual

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Updated: January 2019
 
 

General Driver Parameters

This section describes other drivers that apply to the kernel.

SPARC: dax_stats_flags Flag

Description

This parameter controls what dax kstats are collected by the dax driver. This parameter can be set through the /etc/system.d directory. See /etc/system.d/ Directory Files for more information. Alternatively, you can also use the mdb -kw command. To read the parameter's current value, use the mdb -k dax_stats_flags/D.

Data Type

Unsigned Integer

Default

1

Range

Possible Values

  • 1 – dax unit statistics collection only, excluding queue and CPU statistics.

  • 2 – dax queue and dax CPU statistics collection. This setting is not recommended because collecting queue and CPU statistics can have an impact on performance.

  • 3 – dax unit, queue and CPU statistics collection

Dynamice?

No

Validation

None

When to Change

When dax queue and or dax cpu statistics are needed.

Commitment Level

Unstable

ddi_msix_alloc_limit Parameter

Description

x86 only: This parameter 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 an /etc/system.d/file or by setting it with mdb before the device driver attach occurs.

Data Type

Signed integer

Default

SPARC based systems: 8

x86 based systems: 2 If the system supports x2APIC, the apix module can increase the default value to 8.

Range

2-8

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 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

moddebug Parameter

Description

When this parameter is enabled, messages about various steps in the module loading process are displayed.

Data Type

Signed integer

Default

0 (messages off)

Range

Here are the most useful values:

  • 0x80000000 – Prints [un] loading... message. For every module loaded, messages such as the following appear on the console and in the /var/adm/messages file:

    Apr 20 17:18:04 neo genunix: [ID 943528 kern.notice] load 'sched/TS_DPTBL' id 15
    loaded @ 0x7be1b2f8/0x19c8380 size 176/2096
    Apr 20 17:18:04 neo genunix: [ID 131579 kern.notice] installing TS_DPTBL,
    module id 15.
  • 0x40000000 – Prints detailed error messages. For every module loaded, messages such as the following appear on the console and in the /var/adm/messages file:

    Apr 20 18:30:00 neo unix: Errno = 2
    Apr 20 18:30:00 neo unix: kobj_open: vn_open of /platform/sun4v/kernel/exec/sparcv9/intpexec fails
    Apr 20 18:30:00 neo unix: Errno = 2
    Apr 20 18:30:00 neo unix: kobj_open: '/kernel/exec/sparcv9/intpexec'
    Apr 20 18:30:00 neo unix:  vp = 60015777600
    Apr 20 18:30:00 neo unix: kobj_close: 0x60015777600
    Apr 20 18:30:00 neo unix: kobj_open: vn_open of /platform/SUNW,Sun-Fire-T200/kernel/exec/sparcv9
    /intpexec fails,
    Apr 20 18:30:00 neo unix: Errno = 2
    Apr 20 18:30:00 neo unix: kobj_open: vn_open of /platform/sun4v/kernel/exec/sparcv9/intpexec fails
  • 0x20000000 - Prints even more detailed messages. This value doesn't print any additional information beyond what the 0x40000000 flag does during system boot. However, this value does print additional information about releasing the module when the module is unloaded.

These values can be added together to set the final value.

Dynamic?

Yes

Validation

None

When to Change

When a module is either not loading as expected, or the system seems to hang while loading modules. Note that when 0x40000000 is set, system boot is slowed down considerably by the number of messages written to the console.

Commitment Level

Unstable