On 06/14/2016 09:58 PM, Christoph Hellwig wrote:
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Interupts marked with this flag are excluded from user space interrupt affinity changes. Contrary to the IRQ_NO_BALANCING flag, the kernel internal affinity mechanism is not blocked. This flag will be used for multi-queue device interrupts.
It's great to see that the goal of this patch series is to configure interrupt affinity automatically for adapters that support multiple MSI-X vectors. However, is excluding these interrupts from irqbalanced really the way to go? Suppose e.g. that a system is equipped with two RDMA adapters, that these adapters are used by a blk-mq enabled block initiator driver and that each adapter supports eight MSI-X vectors. Should the interrupts of the two RDMA adapters be assigned to different CPU cores? If so, which software layer should realize this? The kernel or user space?
Sorry that I missed the first version of this patch series. Thanks, Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
