linux-kernel - Re: [patch 2/4] x86: Do not use hpet MSI as clockevent broadcast device

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Date:	Thu, 14 Jan 2010 18:07:03 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>,
	Mark Hounschell <markh@...pro.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Alain Knaff <alain@...ff.lu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: Re: [patch 2/4] x86: Do not use hpet MSI as clockevent broadcast
 device

On Thu, 2010-01-14 at 18:00 -0800, H. Peter Anvin wrote:
> On 01/14/2010 05:39 PM, Venkatesh Pallipadi wrote:
> > Current kernel uses hpet MSI interrupts as both percpu clockevent device
> > and also as clockevent broadcast device in place of IRQ0 timer.
> > There seems to be issues with HPET MSI usage on some platforms. So,
> > restrict it to be only used as a percpu clockevent device.
> 
> Any ideas of which platforms?  It would help avoiding "cargo cult
> programming" in the future.
> 
> Other than that, I presume this is a .33 patch?
> 
> 	-hpa
> 

The problem reported by Mark has only been on (AMD) 790x series chip
sets.

I am not quite sure what the quick-fix for .33 would be.
- Either use dmi to stop using HPET MSI on this chipset
- or stop using HPET MSI altogether, until this complete patchset
provides a better alternative for .34.
I think it should be first option.

Thanks,
Venki

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