[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Dynamically adjust nr_pirqs (aka extra_domU_irqs) from 32 default to an value based on MSI-X options, etc.
>>> On 15.09.15 at 15:42, <konrad.wilk@xxxxxxxxxx> wrote: > We are running into issues where our guests immediately exhaust > the amount of PIRQs. Using the 'extra_guest_irqs' of course fixes > it but it would be nice to have this be dynamic. > > One idea I had been toying with was that when an device is inserted > into an domain we check how many MSI-X it could have and raise > the nr_pirqs by that. But that would entail some extra logic in > the libxl. And naturally an hypercall to modify the nr_pirqs. > > The other is to evaluate also based on MSI-X - but in the > hypervisor as it already has logic to do figure out MSI-X and such. > > Would appreciate feedback, thoughts, etc. Growing nr_pirqs at any point would be no problem. The issue I see is making sure it gets shrunk back as needed. In any event I would favor a solution inside the hypervisor over one involving the tool stack. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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