Stuart Henderson <[email protected]> wrote: > user timecounters do not work everywhere, they require invariant TSC > ("ITSC" shown in cpu flags), plus they require that the TSCs are in > fairly close sync on the different cores, and that they don't drift > too much. > > On your machine there is too much difference between the TSC on > the cpu cores so can't be used as shown by this in your dmesg: > > > cpu1: TSC skew=-650 observed drift=0 > > cpu1: disabling user TSC (skew=-650)
there is unfinished work, to attempt to "tune" the TSC's closer together on such machines. Noone has stepped up yet.
