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

On 08/08/2017 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.

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


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