And I'd still be interested (as in, genuinely curious, not skeptical) to hear what sorts of applications benefit from optimized kernels (HPC? I/O intense?) and what kind of performance increases one can get.
I'd be interested as well. I can see HPC applications potentially benefiting but what about "real world" applications? Web, Email, Databases, App Servers, etc
I'm specifically curious about it as I spent some time in Gentoo Land and optimized everything seemed to be the mantra. In my own experience the *apparent* performance difference between a system compiled as "AMD optimal" vs "Standard x86-64" was minimal to the point of being unnoticeable.