Matthew Wilcox <matthew@xxxxxx> writes: > Currently, Linux supports multiple MSI-X interrupts per device, but only > a single MSI interrupt. This patch series adds support to the generic > PCI code for supporting multiple MSI interrupts. Architectures will > need to add support for multiple MSIs, and I have a patch to do that for > x86 (which needs some more work). Getting this patch series in first > is important so we can start supporting this interface in drivers and > architectures independently. Do we have any benchmarks anywhere that show that multiple msi support gains us something? The requirement to allocate a contiguous block of vector numbers worries me for the x86 implementation. I don't like the idea of having to deal with allocations that can fail because of fragmentation. The fact that we also can not honor the irq affinity properly for multiple msi also disturbs me. At a quick skim your patchset is only the generic code without a single architecture specific implementation so it appears you have not done the hard work on figuring out how to deal with multiple msi in the real world. Given that msi-x does not have any of these issues without data to say that there is a true gain in supporting multi-msi I don't see the point of supporting it. Eric -- 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
