linux-kernel - Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit

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Message-ID: <alpine.DEB.2.11.1506022302340.20347@nanos>
Date:	Tue, 2 Jun 2015 23:03:26 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <ak@...ux.intel.com>
cc:	Andy Lutomirski <luto@...capital.net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH RFC] x86, tsc: Allow for high latency in
 quick_pit_calibrate()



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.

Thanks,

	tglx
 
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