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

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Message-ID: <alpine.DEB.2.11.1506031822160.31424@nanos>
Date:	Wed, 3 Jun 2015 18:23:03 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Adrian Hunter <adrian.hunter@...el.com>
cc:	Andi Kleen <ak@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	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 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. 

Thanks,

	tglx
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