Re: [Xen-devel] RE: regression from IRQ handling changes?

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

It isn't hard to boot UP and with APIC disabled to test this case. I would
prefer to contineu to support it for a while longer, so please do take a
look at it Xiantao.

 Thanks,
 Keir

On 14/09/2009 07:59, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

> While agreeing from a technical perspective, customer perspective on our
> products is different: Whenever something like proper UP (no-APIC)
> support breaks in our products, we almost immediately get reports of this,
> since there will always be someone running Xen e.g. on an old laptop (no
> matter whether Xen is meant to be run there).
> 
> Less frequent for ACPI, but quite recently we had a report there too (and
> I'm under the impression that no-ACPI support has been broken for quite
> a while) - luckily, a BIOS update fixed the issue for them, so I didn't have
> to look into the issue in more detail.
> 
> Otoh, if we really wanted to switch over to APIC and ACPI being a
> requirement, I wouldn't mind that step - it just should be that it's clear
> whether this is intended to work. And if it isn't, quite a bit of code should
> be eliminated/cleaned up.
> 
> Jan
> 
>>>> "Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx> 12.09.09 03:58 >>>
> Jan, 
>     Frankly speaking, we haven't done the testings which can cover non-APIC
> case.  Does anybody really care about such case now ?  I can't figure out the
> reason why modern system doesn't leverage apic. If non-APIC case is necessary,
> maybe we need to fix it.   As I know, Xen is becoming more and more dependent
> on the components (APIC, ACPI....), so non-APIC or non-ACPI cases maybe
> becoming less and less important.
> Xiantao
> 
> Jan Beulich wrote:
>> Using c/s 20189, I can't boot my (only) system without APIC anymore. I
>> didn't have time to look into the issue in more detail so far, but
>> since it seems likely that this is connected to the recent
>> per-CPU-IRQ-vector changes, I wanted to ask whether these had been
>> tested on APIC-less systems.
>> 
>> Thanks, Jan
> 
> 
> 
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