Date: Mon, 27 Oct 1997 01:48:47 -0800 From: David Greenman <dg@root.com> To: sthaug@nethelp.no Cc: jamil@trojanhorse.ml.org, hackers@FreeBSD.ORG Subject: Re: Parity Ram Message-ID: <199710270948.BAA24643@implode.root.com> In-Reply-To: Your message of "Mon, 27 Oct 1997 08:24:14 %2B0100." <2722.877937054@verdi.nethelp.no>
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>ECC based on parity memory is fairly inexpensive. You need 12.5% more >bits, total, and a chipset that can handle ECC. This lets you correct >all single bit errors and detect all double bit errors (also many >multiple bit errors). Actually, it's not a percentage. It works out like this: data_bits ECC_bits 8 5 16 6 32 7 64 8 As you can see, at 64 data bits the number of extra bits needed to implement ECC is the same as is needed for byte parity. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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