Re: Software based ECC ?

[chibiryuu]

On 8/12/07, Folkert van Heusden <folkert@xxxxxxxxxxxxxx> wrote:
> > > http://pdos.csail.mit.edu/papers/softecc:ddopson-meng/softecc_ddopson-meng.pdf
> > > "SoftECC : A System for Software Memory Integrity Checking"
> >
> > Personally, I'd recommend just shelling out the bucks for hardware ECC if
> > the reliability matters.
>
> a question and an idea: Q: is ecc guaranteed to detect all bitflips?
>
> Idea: what about a multicore system (3 or more) that runs the same
> processes on 2 cores and a third core verifying that they both do the
> same? As I think it is not only ram that can become faulty.

Such hardware does exist -- for example, Stratus sells systems that
run the same OS on two separate boards in lockstep, with a voter to
determine what action to take if they ever diverge.
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