Hi All, I am working on a kernel module for a PCI chip. The module registers several PCI MSI interrupts. After a certain while, during the course of using the PCI chip, the kernel module fails to receive interrupts (IRQ handler routine is not called), or receives them very sporadically (after every 2 seconds or so). However, if I change the irq affinity to CPU 16 from the default (CPU 10), everything seems to work fine (mostly). Further, if I change the IRQ affinity to CPU 0, I receive even fewer (almost no) interrupts, and the chip become unusable. Considering the fact that the CPU's are idle (no one uses CPU 10 for IRQ handling), why does changing the IRQ affinity from CPU 10 to CPU 16 makes things better? And changing it to CPU 0 or CPU 1 makes it so much worse. I understand there will be some performace penatly if a certain CPU is handling interrupts from multiple devices, but that does not seem to be the case here. Please advise. Thanks, kchahal -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
