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    SubjectRe: [patch] SMP alternatives
    On Thu, Nov 24, 2005 at 11:16:36AM -0800, thockin@hockin.org wrote:
    > On Thu, Nov 24, 2005 at 06:58:52AM -0700, Eric W. Biederman wrote:
    > > > That's supposed to be done by hardware, no?
    > > > At least the K8 has a hardware scrubber (although it's not always enabled)
    > >
    > > Recent good implementations like the Opteron will do it for you.
    > > Older or cheaper memory controllers will not.
    >
    > Beware of errata - there's at leats one errata on Opteron which forces you
    > to choose between x4 (chipkill) ECC and scrubber. One or the other, but
    > not both. There are plenty of errata on the scrubber alone. Worse, if my
    > (brain)memory is correct, without the scrubber, correctable errors are
    > corrected on the fly, but never written back to DRAM.

    All the scrub errata were fixed with E stepping AFAIK.

    You have a point that using a sw scrubber might make sense on earlier
    steppings though in case someone really wants chipkill.

    -Andi
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