Re: [PATCH] x86: change IO-APIC ack method default forsingle IO-APIC systems

["Jan Beulich" <jbeulich@novell.com>]

>>> Keir Fraser <keir.fraser@eu.citrix.com> 21.01.09 15:37 >>>
>On 21/01/2009 14:23, "Jiang, Yunhong" <yunhong.jiang@intel.com> wrote:
>
>> xen-devel-bounces@lists.xensource.com <> 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.

Right - but MSIs were the only interrupts staying alive on that system with
the 'new' method.

Jan