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    SubjectRe: [Lguest] [PATCH RFC/RFB] x86_64, i386: interrupt dispatch changes
    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)..

    I'm sorry, but the whole effort is misguided, in my opinion. If you
    want to optimize, try reducing the number of interrupts that occur
    rather than saving a few cycles in the interrupt path.

    I have a truly marvellous patch that fixes the bug which this
    signature is too narrow to contain.

     \ /
      Last update: 2008-11-29 19:35    [W:0.025 / U:43.172 seconds]
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