Re: [Xen-devel] [PATCH] x86: change IO-APIC ack method default for single IO-APIC systems

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 21/01/2009 14:23, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
>> Ever since 3.0.2 we've been carrying this patch in our products. Since
>> there was no indication that there would be anything wrong with the
>> 'new' IO-APIC ack method added back then, we finally decided to drop
>> this patch recently from SLE11, to find that the subsequent release
>> candidate failed to work on at least on system without using
> 
> This is a bit strange, a bit curios that do you know the reason that it not
> working? 

Yes - this also -- there doesn't seem to be a good reason that the 'new'
ack_type wouldn't work in all cases. We're also somewhat depending on it (or
similar) for unmaskable MSIs.

 -- Keir



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