From the article:
Very interesting indeed.
Up next in my Linux 3.12 kernel performance investigation will likely be binary driver tests and power consumption monitoring.
Lat time I checked (~year ago), 'ondemand' had, err, interesting effect on the nVidia binary driver performance. While I could not really measure it, 'performance' seemed to have less shuttering.
On the other hand, leaving a dual Xeon beast with performance had a noticeable impact on my power usage under medium loads (multiple active VMs), so I stayed with ondemand.
DEV: Intel S2600C0, 2xE52658V2, 32GB, 4x2TB, GTX780, F20/x86_64, Dell U2711.
SRV: Intel S5520SC, 2xX5680, 36GB, 4x2TB, GTX550, F20/x86_64, Dell U2412..
BACK: Tyan Tempest i5400XT, 2xE5335, 8GB, 3x1.5TB, 9800GTX, F20/x86-64.
LAP: ASUS N56VJ, i7-3630QM, 16GB, 1TB, 635M, F20/x86_64.