Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate()

From	Adrian Hunter <adrian.hunter@intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate()
Date	2015-06-22 13:30 +0200
Message-ID	<pE85k-2e7-35@gated-at.bofh.it> (permalink)
References	(8 earlier) <px52y-1bs-15@gated-at.bofh.it> <px5ce-1n6-3@gated-at.bofh.it> <px7H4-5d1-9@gated-at.bofh.it> <pxc41-3nS-3@gated-at.bofh.it> <pxjIf-6rK-23@gated-at.bofh.it>
Organization	Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki

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On 03/06/15 19:23, Thomas Gleixner wrote:
> On Wed, 3 Jun 2015, Adrian Hunter wrote:
> 
>> On 03/06/15 06:30, Andi Kleen wrote:
>>>> Then the changelog should say that I think.  The current text says
>>>> "Fast TSC calibration will always fail", which, to me, suggests that
>>>> either the slow calibration will work or that the changelog message
>>>> should be changed.
>>>
>>> Ok. No, the slow calibration works I believe.
>>
>> Yeah, so the (only?) downside is the 50ms wasted on Fast TSC
>> calibration.  What about this?
> 
> I'm certainly happy to apply this one. 

George Spelvin began investigating improving quick_pit_calibrate() but Ingo
anyway suggested this patch as the first, so can this be applied?

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Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate() Adrian Hunter <adrian.hunter@intel.com> - 2015-06-22 13:30 +0200

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