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

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Message-ID: <CA+55aFzvKGRvk5fMq0DuJ+9y2Uqs_d1q-mG3jOy3oq8gxoyuBA@mail.gmail.com>
Date:	Wed, 3 Jun 2015 06:45:45 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.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, Jun 3, 2015 at 1:13 AM, Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> Yeah, so the (only?) downside is the 50ms wasted on Fast TSC
> calibration.  What about this?

That's certainly simpler.

What platform is this? Do you have access to hw people you can shake
down and ask what clock we can really _trust_?

                    Linus
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