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

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Date:	Wed, 23 Dec 2009 09:19:42 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>
CC:	Mark Hounschell <markh@...pro.net>,
	"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

 

>-----Original Message-----
>From: Linus Torvalds [mailto:torvalds@...ux-foundation.org] 
>Sent: Wednesday, December 23, 2009 8:50 AM
>To: Andi Kleen
>Cc: Mark Hounschell; Pallipadi, Venkatesh; dmarkh@....rr.com; 
>Alain Knaff; Linux Kernel Mailing List; 
>fdutils@...tils.linux.lu; Li, Shaohua; Ingo Molnar
>Subject: Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28
>
>
>
>On Wed, 23 Dec 2009, Andi Kleen wrote:
>> 
>> I suspect it's a system where the APIC timer stops in deeper idle
>> states and it supports them. In this case CPU #0 does timer 
>broadcasts
>> when needed to wake the other CPUs up from deep C, but for 
>that it has
>> to run with HPET. At least the other ones can still enjoy the LAPIC
>> timer.
>
>Ahh, ok, that makes sense. I was assuming the broadcast timer 
>would act in 
>that capacity, but..

This is what I was thining yday and asked Mark to try idle=halt.
This /proc/interrupts is with idle=halt when there should not be any
C-states and broadcasts involved.
>>> HPET_MSI-edge      hpet2
>>> NMI:          0          0          0          0   
>>> Non-maskable interrupts
>>> LOC:        268     513395     513138     522088   Local timer 
>>> interrupts

Not sure how this is related to floppy problem. But, we surely
have something wrong with percpu HPET usage here.

Thanks,
Venki
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