Re: [arch-general] CONFIG_CC_OPTIMIZE_FOR_SIZE is not set

On Thu, Oct 22, 2009 at 11:06:32PM +0200, Thomas Bächler wrote:

Sascha Siegel schrieb:

...

Hi,

can someone tell my whats the reason for building the arch-kernel with "# CONFIG_CC_OPTIMIZE_FOR_SIZE is not set"?

Thank you!

Optimizing for size sacrifices performance. Read the gcc documentation about the -O{1,2,3,s} options.

I don't know if it is as simple as that. I recall reading somewhere that under certain circumstances a binary optimized with -Os is faster than a binary optimized with -O2. The reason for this is that a smaller binary may load faster than a big one and cause less page faults.