Kernel tune

[sharathkv25]

Hi,

I am tuning the kernel to run Oracle10g on it.

In sam, all the configurabel kernel params, are shown as "formula/value".

Which is better, giving an absoulte value? or calcultaing NPROC * N, where I need to calculate the value of N.

Some paramters have hexa decimal values in the formula/value column.

Can anyone help me more on this. I am doing this for the first time.

thanks

[Pete Randall]

Frankly, I prefer to use "values" so that I know what I'm changing and what I'm changing it to. "Formulas" can affect other parameters and are best avoided.


Pete

[A. Clay Stephenson]

In almost all cases, it makes more sense to replace the formula with a hard value BUT you have to know what the values mean. It is rather easy to create an unbootable kernel so the first thing that I would do is have a kernel that you know will absolutely, positively boot. Make a copy of /stand/vmunix such as /stand/vmunix.SAFE and a similar safe copy of /stand/system. The system keeps its most recent backup as vmunix.prev so don't use that name as your safe version. If you have these safe copies, no matter how badly you mess up a kernel, you will still be able to boot.