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

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Message-Id: <200701090014.42144.ak@suse.de>
Date:	Tue, 9 Jan 2007 00:14:41 +0100
From:	Andi Kleen <ak@...e.de>
To:	discuss@...-64.org
Cc:	Adrian Bunk <bunk@...sta.de>,
	"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.

> 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?

> 
> 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
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