output of kctune command

[Md. Minhaz Khan]

Dear all

When i give kctune command to query about a kernel parameter i found below output.Can any one tell me what is meant by "Expression" comulmn
and "Changes" column??


# kctune shmseg
Tunable Value Expression Changes
shmseg 300 Default Immed


Thanks
Minhaz

[Jitesh purohit_1]

Hi Minhaz ,

if you check the man page of " kctune " it says as below

The expression used to set the value of the tunable, if any. If the tunable is set to default, this field contains the word Default.

Thanks
Jitesh

[Md. Minhaz Khan]

Thanks jitash

I have another query "When i want to modify a kernel tunable parameter say "shmmni" i have found below parameter for giving value:

New setting[Expression/Value]: ___________________

New setting (evaluated): ___________________
[ Recalculate ]

My question is what is meant by "New setting(evaluated):...."

Thanks
Minhaz

[Dennis Handly]

>what is meant by "New setting(evaluated)"?

If the new setting is a symbolic expression: KERNEL_PARM1 * 20
This evaluates that expression.

[SoorajCleris]

Hi,

You can see there is a recalculate tab, when you update anything with formula/the new stting and when you use that it just update the value as Dennis told.

Regards,
Sooraj

[Steven E. Protter]

Shalom,

Not sure I am adding much.

Default means that shmseg is set to the current value by the OS install and has not been changed.

Immed means you can change the value without compiling a kernel and rebooting the system.

SEP

[Md. Minhaz Khan]

Thanks a lot everybody to help me.