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

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Message-ID: <alpine.LFD.2.00.1009181140010.2416@localhost6.localdomain6>
Date:	Sat, 18 Sep 2010 11:41:56 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Damien Wyart <damien.wyart@...e.fr>
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>,
	John Drescher <drescherjm@...il.com>,
	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 Sat, 18 Sep 2010, Damien Wyart wrote:

> * Thomas Gleixner <tglx@...utronix.de> [2010-09-15 15:11]:
> > > 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 for this different solution seemed fine, but it seems only the
> first one was commited into mainline and then stable. Is this intended?

Yes. I wanted to have confirmation for the second solution (also from
the HW folks). I'm queueing it for .37

Thanks,

	tglx
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