linux-kernel - Re: [discuss] [PATCH 4/4] x86_64 ioapic: Improve the heuristics for when check

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Date:	Tue, 9 Jan 2007 00:21:31 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Andi Kleen <ak@...e.de>
Cc:	discuss@...-64.org, "Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai.lu@....com>,
	Linus Torvalds <torvalds@...l.org>, mingo@...hat.com,
	Tobias Diedrich <ranma+kernel@...edrich.de>
Subject: Re: [discuss] [PATCH 4/4] x86_64 ioapic: Improve the heuristics for when check_timer fails.

On Tue, Jan 09, 2007 at 12:14:41AM +0100, Andi Kleen wrote:
> 
> > We just got a completely different bug reported that was confirmed to be 
> > caused by Andi's patch:
> >    AMD64/ATI : timer is running twice as fast as it should [1]
> 
> I have such a machine that showed this problem and when I wrote the patch I 
> tested it on it (and on a couple of others of course). No twice as fast on 
> my testing.
> 
> In fact there are two types of ATI machines: ones that have a BIOS workaround
> for the original Linux issue and ones that don't. Keeping both
> happy is not easy.
> 
> So I'm somewhat dubious on that. Where is that report?

Follow the link [1] in my email (and the bug is already assigned to 
you).

> > My whole point is that for 2.6.20, we can live with simply reverting 
> > Andi's commit.
> 
> I agree. It's more problematical than I expected. Reverting is 
> the best option right now.
> 
> -Andi

cu
Adrian

[1] http://bugzilla.kernel.org/show_bug.cgi?id=7789

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