linux-kernel - Re: Software based ECC ?

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Message-ID: <66dc75180708121205q5e90958u4f3eed9b788faf07@mail.gmail.com>
Date:	Sun, 12 Aug 2007 15:05:46 -0400
From:	chibiryuu <ephemient@...il.com>
To:	"Folkert van Heusden" <folkert@...heusden.com>
Cc:	Valdis.Kletnieks@...edu, roland <devzero@....de>,
	linux-kernel@...r.kernel.org
Subject: Re: Software based ECC ?

On 8/12/07, Folkert van Heusden <folkert@...heusden.com> 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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