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Re: [Xen-devel] [PATCH] x86/apic/x2apic: Share IRQ vector between cluster members only when no cpumask is specified

On 08/08/17 14:25, Boris Ostrovsky wrote:
> On 08/08/2017 05:48 AM, Jan Beulich wrote:
>>>>> Andrew Cooper <andrew.cooper3@xxxxxxxxxx> 08/07/17 7:19 PM >>>
>>> More than once, we've discussed freeing up the legacy PIC range of
>>> vectors, and freeing up the unallocated vectors in 0xfx.
>> And that's something I would prefer over the change proposed here,
>> albeit I realize that the amount of vectors to recover isn't that large.
> That would only net us 32 vectors at the most. That probably wouldn't be
> sufficient in many cases where we are currently having vector shortage.
> Unfortunately I don't have access to my failing system to say how may
> vectors I was short but I believe it was more than that.

Indeed, which is why I haven't actually undertaken the work.  It doesn't
come close to solving the problem.

> (I am also not sure I understand what is meant by "freeing". Where are
> they going?)

By "freeing", I mean "available for general irq use" rather than being
reserved and unused in the system.


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