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    SubjectRe: [Cbe-oss-dev] [RFC, PATCH 4/4] Add support to OProfile for profiling Cell BE SPUs -- update
    On Tue, 30 Jan 2007 15:31:09 -0800
    Carl Love <cel@us.ibm.com> wrote:

    > An LFSR sequence is similar to a pseudo random number sequence. For a 24
    > bit LFSR sequence each number between 0 and 2^24 will occur once in the
    > sequence but not in a normal counting order. The hardware uses the LFSR
    > sequence to count to since it is much simpler to implement in hardware
    > then a normal counter. Unfortunately, the only way we know how to
    > figure out what the LFSR value that corresponds to the number in the
    > sequence that is N before the last value (0xFFFFFF) is to calculate the
    > previous value N times. It is like trying to ask what is the pseudo
    > random number that is N before this pseudo random number?

    That should be no problem.
    You can just revers your algorithm and let it run x times instead of 0xFFFFFF-x.

    >
    > I will add a short comment to the code that will summarize the above
    > paragraph.
    > [snip]
    >
    > _______________________________________________
    > cbe-oss-dev mailing list
    > cbe-oss-dev@ozlabs.org
    > https://ozlabs.org/mailman/listinfo/cbe-oss-dev


    --
    Mit freundlichen Grüssen,
    kind regards,

    Christian Krafft
    IBM Systems & Technology Group,
    Linux Kernel Development
    IT Specialist
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