Messages in this thread | | | From | Andy Lutomirski <> | Date | Tue, 2 Jun 2015 17:21:27 -0700 | Subject | Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() |
| |
On Tue, Jun 2, 2015 at 4:38 PM, Andi Kleen <ak@linux.intel.com> wrote: > On Tue, Jun 02, 2015 at 11:03:26PM +0200, Thomas Gleixner wrote: >> >> >> On Tue, 2 Jun 2015, Andi Kleen wrote: >> >> > > There's the code in tsc_msr.c. It should be relatively >> > > straightforward to extend it to cover everything that intel_pstate >> > > supports. >> > >> > That's a good idea, but we still need an always working fallback when the >> > model number is not available. So Adrian's patch is needed in any >> > case. >> >> Nonsense. The slow calibration is already a working fallback. > > Please read Adrian's description again. It's not working when the PIT read is > too slow. That is when the new algorithm is needed. >
tglx's suggestion was to use slow calibration as a fallback.
--Andy
| |