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Solaris Tunable Parameters Reference Manual
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General Driver Parameter

moddebug

Description

Used to cause messages about various steps in the module loading process to be 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

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  Published under the terms fo the Public Documentation License Version 1.01. Design by Interspire