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Keith Busch
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The irq_create_affinity_masks routine is responsible for assigning a number of interrupt vectors to CPUs. The optimal assignemnet will spread requested vectors to all CPUs, with the fewest CPUs sharing a vector. The algorithm may fail to assign some vectors to any CPUs if a node's CPU count is lower than the average number of vectors per node. These vectors are unusable and create an un-optimal spread. Recalculate the number of vectors to assign at each node iteration by using the remaining number of vectors and nodes to be assigned, not exceeding the number of CPUs in that node. This will guarantee that every CPU is assigned at least one vector. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: linux-nvme@lists.infradead.org Link: http://lkml.kernel.org/r/1491247553-7603-1-git-send-email-keith.busch@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.