Help on difference of running on varius x86 with linux

[Martin v. Loewis]

> It's right or there is some things that i don't have see.

It is entirely possible that the execution speed of a certain code
varies from processor to processor. Some instructions behave better on
some processor, and different ones on another. Still, the -O options
only perform processor-independent optimizations, such as function
inlining.

> Another question when i use CPU optimization, i have used the same
> that are used for compile the kernel what happen ?
> Can give suggest where find this info

You can find the documentation of all command line flags in the gcc
manual. You can find the gcc manual by invoking 'info' on your system.

Regards,
Martin