General Driver Parameters

moddebug

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:

  Nov 5 16:12:28 sys genunix: [ID 943528 kern.notice] 
  load 'sched/TS_DPTBL' id 9 loaded @ 0x10126438/
  0x10438dd8 size 132/2064 
  Nov 5 16:12:28 sys genunix: [ID 131579 kern.notice] 
  installing TS_DPTBL, module id 9.

• 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:

  Nov 5 16:16:50 sys krtld: [ID 284770 kern.notice] 
  kobj_open: can't open /platform/SUNW,Ultra-80/kernel/
  sched/TS_DPTBL
  Nov 5 16:16:50 sys krtld: [ID 284770 kern.notice] 
  kobj_open: can't open /platform/sun4u/kernel/sched/
  TS_DPTBL
  Nov 5 16:16:50 sys krtld: [ID 797908 kern.notice] 
  kobj_open: '/kernel/sch...
  Nov 5 16:16:50 sys krtld: [ID 605504 kern.notice] 
  descr = 0x2a
  Nov 5 16:16:50 sys krtld: [ID 642728 kern.notice] 
  kobj_read_file: size=34,
  Nov 5 16:16:50 sys krtld: [ID 217760 kern.notice] 
  offset=0
  Nov 5 16:16:50 sys krtld: [ID 136382 kern.notice] 
  kobj_read: req 8192 bytes,
  Nov 5 16:16:50 sys krtld: [ID 295989 kern.notice] 
  got 4224
  Nov 5 16:16:50 sys krtld: [ID 426732 kern.notice] 
  read 1080 bytes
  Nov 5 16:16:50 sys krtld: [ID 720464 kern.notice] 
  copying 34 bytes
  Nov 5 16:16:50 sys krtld: [ID 234587 kern.notice] 
  count = 34
  [33 lines elided]
  Nov 5 16:16:50 sys genunix: [ID 943528 kern.notice] 
  load 'sched/TS_DPTBL' id 9 loaded @ 0x10126438/
  0x10438dd8 size 132/2064
  Nov 5 16:16:50 sys genunix: [ID 131579 kern.notice] 
  installing TS_DPTBL, module id 9.
  Nov 5 16:16:50 sys genunix: [ID 324367 kern.notice] 
  init 'sched/TS_DPTBL' id 9 loaded @ 0x10126438/
  0x10438dd8 size 132/2064

• 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

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 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

Change History

For information, see ddi_msix_alloc_limit (Solaris 10 Release and OpenSolaris 2009.06 Release).