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

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Message-ID: <87d3sdfo9p.fsf@spindle.srvr.nix>
Date:	Thu, 16 Sep 2010 21:04:50 +0100
From:	Nix <nix@...eri.org.uk>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Neil Brown <nfbrown@...ell.com>, linux-nfs@...r.kernel.org
Subject: Re: [PATCH RFC] x86: hpet: Avoid the readback penalty

On 15 Sep 2010, Thomas Gleixner said:

> 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 ?

Works for me. (I still have boot problems, but these seem to be
NFS-related: -ESTALE from an apparently random subset of my mount points
at initial mount time. Restarting rpc.mountd on the server fixes
it. This is with nfs-utils 1.2.2, but I see it right up to 60abb98, that
being the most recent version I tested. This doesn't happen if the
client is running 2.6.34.x, as far as I can tell. It also doesn't happen
with all my 2.6.35.x clients. Sigh. I hate bugs like this.)
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