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    SubjectRe: Multiple MSI, take 3
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    From: Matthew Wilcox <matthew@wil.cx>
    Date: Fri, 11 Jul 2008 04:23:26 -0600

    > On Fri, Jul 11, 2008 at 03:06:33AM -0700, Eric W. Biederman wrote:
    > > So unless the performance of the AHCI is better by a huge amount I don't
    > > see the point, and even then I am extremely sceptical.
    >
    > I don't have performance numbers yet, but surely you can see that
    > avoiding a register read in the interrupt path is a large win?

    Such overhead is going to be amortized.

    AHCI is not like networking where we have lots of very small
    transactions to deal with, and therefore the per-IRQ overhead can
    begin to dominate.

    Therefore, like Eric, I think workng on multiple MSI is a very dubious
    usage of one's time. But, it's your time, so use it how you wish :)


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