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    SubjectRe: Linux & ECC memory

    On Thu, 14 Nov 1996, Richard B. Johnson wrote:

    > Since RAM access happens so quickly, keeping statistics on corrections
    > that have occurred could seriously impact performance. The performance of
    > VAXes was not seriously affected because they were soooooo sloooow to
    > begin with.

    I'm not so sure about that. Incrementing a counter on an ECC trigger
    doesn't seem impossible. (Hmm. Unless the ECC isn't a compare-and-fix
    cycle, but rather a discrete chunk of logic that always applies the math
    without looking at what it is doing. I'm not knowledgable enough about the
    algorithms involved to say for sure.)

    And, to switch it around, if the ECC is being used often enough to degrade
    performance, wouldn't you want to know about it? (Especially since an ECC
    is by its nature a statistical operation. Multi-bit errors can go
    undetected, and even be miscorrected.)

    --
    Kenneth Albanowski (kjahds@kjahds.com, CIS: 70705,126)



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