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    SubjectRe: [PATCH] Add support for multiple MSI on x86
    Roland Dreier wrote:
    > > Yes, but there are MSI devices in the field...
    >
    > But do any of them benefit from having multiple interrupt vectors available?
    >
    > If I recall correct, willy was motivated by AHCI performance to try this out,
    > and in the end things didn't go any faster using multiple MSI.
    >
    > The big win with multiple interrupt vectors is when you have independent
    > queues that you can point different CPUs at, and give each CPU its own
    > interrupt.

    And this is how AHCI is designed, but libahci.c currently wraps its
    interrupt handler in a device-wide lock. I don't know if that test also
    reorganized the driver code.


    Regards,
    Clemens


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