GCC 4.7.0 can LTO the linux kernel

[curaga]

http://lwn.net/Articles/488180/

https://github.com/andikleen/linux-misc/commits/lto

GCC 4.7 has improved LTO and now can apparently link-time optimize the kernel. Maybe benchmark-worthy?

[RealNC]

Maybe benchmark-worthy?

Nope. The kernel consumes the least amount of CPU time to begin with.

[curaga]

In some cases (like properly built http servers) there is a huge amount of work in kernelspace, in fact the more the better.

In any case, a smaller kernel = better cache usage, measuring this would be nice too.

[alpha_one_x86]

Sys time is very hurge in desktop and server case. n some case better speed = low latency = less user space thread blocked = more performance.
On my server, the kernel time is always at more than 25%.

I'm very interested by benchmark and details for this.