linux-kernel - Re: [Xen-devel] [patch 14/33] xen: xen time implementation

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Date:	Wed, 06 Jun 2007 14:46:59 +0200
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Andi Kleen" <ak@...e.de>, "Keir Fraser" <keir@...source.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	<virtualization@...ts.osdl.org>,
	"Xen-devel" <xen-devel@...ts.xensource.com>,
	"Chris Wright" <chrisw@...s-sol.org>,
	"lkml" <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [patch 14/33] xen: xen time implementation

>>> Andi Kleen <ak@...e.de> 06.06.07 14:18 >>>
>
>> 
>> Yes, this could be an issue. Is there any way to get an interrupt or MCE
>> when thermal throttling occurs?
>
>Yes you can get an thermal interrupt from the local APIC. See the Linux
>kernel source. Of course there would be still a race window.
>
>On the other hand some timing issues on throttling are probably 
>the smallest of the users' problems when it really happens.

Not if this results in your box hanging - I think throttling is exactly intended
to keep the box alive as long as possible (and I've seen throttling in action,
with the box happily recovering from the situation - after having seen it a
few times I checked and found the fan covered with dust).

>Standard Linux just ignores it.

Jan

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