linux-kernel - Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

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Date:	Sun, 27 Dec 2009 12:09:48 +0100
From:	Pavel Machek <pavel@....cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Hounschell <markh@...pro.net>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"dmarkh@....rr.com" <dmarkh@....rr.com>,
	Alain Knaff <alain@...ff.lu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"fdutils@...tils.linux.lu" <fdutils@...tils.linux.lu>,
	"Li, Shaohua" <shaohua.li@...el.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28


> > > This might suggest that Mark's floppy controller doesn't like
> > > deep C? Mark, did you try booting with processor.max_cstate=1
> > > and HPET enabled?
> > 
> > We have indeed had historical issues with floppy and sleep states before. 
> 
> I removed that code when moving to 64bit (floppy driver disabling C1),
> but perhaps we need some variant of it again (but it's the first such
> report in many years). Although it would be sad to have it again on all 
> systems.

C1 is hlt. Are you sure? I could see how C3 could cause problems (DMA
 latency), but...

Can mark simply try with idle=poll?

									Pavel

-- 
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