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

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Message-ID: <alpine.DEB.2.11.1506021442280.3786@nanos>
Date:	Tue, 2 Jun 2015 15:58:20 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Adrian Hunter <adrian.hunter@...el.com>
cc:	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH RFC] x86, tsc: Allow for high latency in
 quick_pit_calibrate()

On Mon, 1 Jun 2015, Adrian Hunter wrote:

> On 21/05/15 10:55, Adrian Hunter wrote:
> > If it takes longer than 12us to read the PIT counter lsb/msb,
> > then the error margin will never fall below 500ppm within 50ms,
> > and Fast TSC calibration will always fail.
> 
> Hi
> 
> This does happen, so it would be nice to have this fix.
> Are there any comments?

Yes. Its on my review list...

Thanks,

	tglx

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