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RE: [Xen-devel] [PATCH 2/4] CPUIDLE: Avoid remnant LAPIC timer intr whil

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 2/4] CPUIDLE: Avoid remnant LAPIC timer intr while force hpetbroadcast
From: "Wei, Gang" <gang.wei@xxxxxxxxx>
Date: Thu, 11 Sep 2008 15:46:34 +0800
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Thread-topic: [Xen-devel] [PATCH 2/4] CPUIDLE: Avoid remnant LAPIC timer intr while force hpetbroadcast
On Thursday, September 11, 2008 3:38 PM, Keir Fraser wrote:
> On 10/9/08 15:25, "Wei, Gang" <gang.wei@xxxxxxxxx> wrote:
>>> It's not clear to me the disable/enable_LAPIC_timer() work is worthwhile for
>>> the few timer interrupts it is likely to avoid. The other bit of the patch
>>> is a good bugfix though. I've taken just the latter part.
>> Thanks for accept most of these patches. As to disable/enable_LAPIC_timer(),
>> I add them because some platforms require the LAPIC timer intr being disabled
>> before entering C3, otherwise there may be some unexpected things. As a
>> reference, Linux kernel always do so.
> Is this a documented aspect of C3, or just one of those things? Do you know
> what kind of 'unexpected things' can happen?

Currently let's just regard it as one of those things. I think kevin's reply 
can explain it better from another perspective.


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