linux-kernel - Re: [PATCH RFC] x86: hpet: Avoid the readback penalty

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Message-ID: <AANLkTineVitetJgKS2AsZUMvuuxDhcPF45dFWK8rtFfd@mail.gmail.com>
Date:	Wed, 15 Sep 2010 09:54:59 -0400
From:	John Drescher <drescherjm@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Nix <nix@...eri.org.uk>,
	Artur Skawina <art.08.09@...il.com>,
	Damien Wyart <damien.wyart@...e.fr>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH RFC] x86: hpet: Avoid the readback penalty

On Wed, Sep 15, 2010 at 9:11 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Tue, 14 Sep 2010, tip-bot for Thomas Gleixner wrote:
>> x86: hpet: Work around hardware stupidity
>
> After my brain recovered from yesterdays exposure with the x86 timer
> horror, I came up with a different solution for this problem, which
> avoids the readback of the compare register completely. It works
> nicely on my affected ATI system, but needs some exposure to the other
> machines.
>
> Comments ?
>

I can test this on my i7 machine in tonight (around 12 hours from now).

John
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