missing kernel parameters

[sumdomo]

Hi everyone,

I installed hpvm 4.20 in one of the hp blade bl860c server by following the installaion, configration manual as guideline.

However from the manual in page 31, it stated some of the kernel parameters will be modified but I found that one of them is missing (lockable_mem_pct).

Does this is correct or anyway I have to insert this?

thanks in advance

[Don Morris_1]

What did you do to believe it is missing? (`kctune lockable_mem_pct`? Something else?)

Assuming this is 11i v3, the tunable is there -- but it is undocumented and private [does not show by default unless set]. You most certainly should not have to insert it.

[sumdomo]

Hi Don,

Yes it is there, just like what you said it is private and not shown from Sam.
So when I do kctune lockable_mem_pct it show
Tunable Value Expression Changes
lockable_mem_pct 3642299 99% Imm (auto disabled)

what is the meaning of (auto disabled)?

thanks.

[Don Morris_1]

It means that by default the tunable value is automatically set by the kernel. Setting it to a different value disables this auto-tuning functionality.

`man 1m kctune` in the "Default Output" section near the end discusses this.

[Ismail Azad]

Hi,

A private kernel parameter is defined within the kernel but is typically not used. Nfiles on 11.31 is an outstanding example for this.

Regards
Ismail Azad

[nijokj]

Hi sumdomo,

Please see the difference between both
1.Output from which the server HPVM is not installed
kctune -v lockable_mem_pct
Tunable lockable_mem_pct
Description Amount of lockable memory (percentage)
Module vm
Current Value 13866526 [Default]
Value at Next Boot Default (automatic)
Value at Last Boot 13866526
Default Value 13866526 (automatic)
Can Change Automatic Tuning Enabled

Output from which the server HPVM is not installed
2.kctune -v lockable_mem_pct
Tunable lockable_mem_pct
Description Amount of lockable memory (percentage)
Module vm
Current Value 34063821 [99%]
Value at Next Boot (auto) [99%]
Value at Last Boot 34063821
Default Value 30967115 (automatic)
Can Change Immediately (Automatic Tuning Disabled)

Conclusion, If you install HPVM software for preparing a server for VMHOST, It automatically change the kernel parameters for making it as suitable for working in VM envirnment.SO at the time of installation it automatically disable the automatic tuning of some tunable to restrict the dynamicaly changes to its default value.
the default value of this tunable is 90%. Hope this will clear your doubts.

[nijokj]

corruption, Please ignore the 2 entry in previous post ,

Output from which the server HPVM is installed
2.kctune -v lockable_mem_pct
Tunable lockable_mem_pct
Description Amount of lockable memory (percentage)
Module vm
Current Value 34063821 [99%]
Value at Next Boot (auto) [99%]
Value at Last Boot 34063821
Default Value 30967115 (automatic)
Can Change Immediately (Automatic Tuning Disabled)