https://bugs.freedesktop.org/show_bug.cgi?id=107784
--- Comment #23 from Dmitrii Tcvetkov demfloro@demfloro.ru ---
Relevant discussion about cf7a63ef4e0203f (x86/tsc: Calibrate tsc only once) http://lkml.iu.edu/hypermail/linux/kernel/1809.0/03226.html
And there is a patch http://lkml.iu.edu/hypermail/linux/kernel/1809.0/04424.html which is on it's way to mainline as I understand.