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Groups > linux.kernel > #1156997
| From | Andy Lutomirski <luto@amacapital.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() |
| Date | 2015-06-03 02:30 +0200 |
| Message-ID | <px4Jb-OH-9@gated-at.bofh.it> (permalink) |
| References | (4 earlier) <px0vV-2W2-13@gated-at.bofh.it> <px0FA-3mU-9@gated-at.bofh.it> <px0YX-3Kj-31@gated-at.bofh.it> <px1BD-4JV-1@gated-at.bofh.it> <px3WN-856-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Andi Kleen <ak@linux.intel.com> - 2015-06-03 01:40 +0200
Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Andy Lutomirski <luto@amacapital.net> - 2015-06-03 02:30 +0200
Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Andi Kleen <ak@linux.intel.com> - 2015-06-03 02:50 +0200
Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Andy Lutomirski <luto@amacapital.net> - 2015-06-03 03:00 +0200
Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Thomas Gleixner <tglx@linutronix.de> - 2015-06-03 18:30 +0200
Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Adrian Hunter <adrian.hunter@intel.com> - 2015-06-04 13:40 +0200
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