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    SubjectRe: [Lguest] [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes
    Date
    On Sunday 30 November 2008 04:52:41 Avi Kivity wrote:
    > Alexander van Heukelum wrote:
    > > I now did the benchmarks for the same -rc6 with hpa's 4-byte stubs
    > > too. Same machine. It's significantly better than the other two
    > > options in terms of speed. It takes about 7% less cpu to handle
    > > the interrupts. (0.64% cpu instead of 0.69%.) I have to run now,
    > > I'll let interpreting the histogram to someone else ;).
    >
    > This is noise. 0.05% cpu on a 1GHz machine servicing 1000 interrupt/sec
    > boils down to 500 cycles/interrupt. These changes shouldn't amount to
    > so much (and I doubt you have 1000 interrupts/sec with a single disk)..

    Sure, but smallest cache wins. Which is why I thought hpa chose the 3 byte
    option.

    > I'm sorry, but the whole effort is misguided, in my opinion.

    Respectfully disagree. I wouldn't do it, but it warms my heart that others
    are. It's are not subtractive from other optimization efforts.

    Cheers,
    Rusty.


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