The irq layer PCI_IRQ_AFFINITY flag makes pci_alloc_irq_vectors() spread all the interrupts around the available CPUs, however, the API doesn't allow to exclude the hyper threading CPU cores or limit the CPUs to use for the affinity mask. If the API had a way to provide an affinity hint into this function instead of having them automatically generated it provide more flexibility to the hfi1 driver.
Sebastian
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