linux-kernel - Re: nmi_watchdog fix for x86

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Date:	Tue, 02 Oct 2007 07:56:24 +0300
From:	Mika Penttilä <mika.penttila@...umbus.fi>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Andi Kleen <ak@...e.de>, Arjan van de Ven <arjan@...radead.org>,
	David Bahi <dbahi@...ell.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <GHaskins@...ell.com>
Subject: Re: nmi_watchdog fix for x86_64 to be more like i386

Thomas Gleixner wrote:
> On Tue, 2 Oct 2007, Andi Kleen wrote:
>   
>>> OTOH, the accounting hook would allow us to remove the IRQ#0 -> CPU#0
>>> restriction. Not sure whether it's worth the trouble.
>>>       
>> Some SIS chipsets hang the machine when you migrate irq 0 to another
>> CPU. It's better to keep that Also I wouldn't be surprised if there are some
>> other assumptions about this elsewhere.
>>
>> Ok in theory it could be done only on SIS, but that probably would really
>> not be worth the trouble
>>     
>
> Agreed.
>
> I just got a x8664-hrt report, where I found the following oddity:
>
>  0:       1197     172881   IO-APIC-edge      timer
>
> That's one of those infamous AMD C1E boxen. Strange, all my systems have 
> IRQ#0 on CPU#0 and nowhere else. Any idea ?
>
> 	tglx
>
>   
Here I have with stock FC7 (2.6.22.9-91) kernel :
 0:     107835  133459760   IO-APIC-edge      timer

Processor:
vendor_id    : AuthenticAMD
cpu family    : 15
model        : 107
model name    : AMD Athlon(tm) 64 X2 Dual Core Processor 4000+
stepping    : 1
cpu MHz        : 2109.721
cache size    : 512 KB

MB:
Asus M2N-E (NF570)

--Mika


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