Date: Wed, 16 Sep 2015 13:04:20 +0100 From: Bob Bishop <rb@gid.co.uk> To: Igor Mozolevsky <igor@hybrid-lab.co.uk> Cc: Konstantin Belousov <kostikbel@gmail.com>, Hackers freeBSD <freebsd-hackers@freebsd.org>, Dieter BSD <dieterbsd@gmail.com>, Andriy Gapon <avg@freebsd.org>, freebsd-hardware@freebsd.org Subject: Re: ECC support Message-ID: <93106DFF-9741-4515-B6E0-AC43C0AF2179@gid.co.uk> In-Reply-To: <CADWvR2ha0-ifBYTswdVF7tzZsHayf%2BKXVdk86S0tuuPmLKj6cg@mail.gmail.com> References: <CAA3ZYrBXZn1WpHWYGJYWJDPsk7iDahCas8RhnHC4w%2Babf4w4hA@mail.gmail.com> <55F88A18.6090504@FreeBSD.org> <20150916035904.GE67105@kib.kiev.ua> <93871ADA-EDA3-481C-9959-1D371AB44479@gid.co.uk> <CADWvR2gBDjKFRW-X6ECJaGG7tSvOgk0rTk38O1qQ0hUWjRBF_A@mail.gmail.com> <3678FC1E-DDC5-4FB2-B6E9-6FC90D0C988E@gid.co.uk> <CADWvR2ha0-ifBYTswdVF7tzZsHayf%2BKXVdk86S0tuuPmLKj6cg@mail.gmail.com>
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> On 16 Sep 2015, at 12:52, Igor Mozolevsky <igor@hybrid-lab.co.uk> wrote: > > On 16 September 2015 at 12:34, Bob Bishop <rb@gid.co.uk> wrote: > > <snip> > > >> "The best we can conclude therefore is that any chip size effect is >> unlikely to dominate error rates given that the trends are not consistent >> across various other confounders such as age and manufacturer.” >> >> I’ll admit to talking that point up a bit but it is counterintuitive. >> Memory designers have always been scared of cosmic rays etc but the >> suspected effects simply have not been noticeable. Most likely as they >> shrink features ever smaller, other factors like material purity dominate. >> > > I saw that after I posted, and had a long ponder as to why it would be so. > The only thing I could think of is that the fab process was(/is?) large > enough to not worry about "nonsense" like cosmic rays &c (but then I've not > had much exposure to semi-conductor electronics theory since late 90s). > Perhaps we're at a point where the fab process can't really shrink much > more with DRAM due to the underlying tech (effectively many tiny RC > circuits), which is the reason the manufacturers just stack ranks to get > more capacity per DIMM instead of packing more in a single chip?.. Dunno. I’ll ask my tame semiconductor expert when I see him tomorrow... > -- > Igor M. > _______________________________________________ > freebsd-hardware@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-hardware > To unsubscribe, send any mail to "freebsd-hardware-unsubscribe@freebsd.org" -- Bob Bishop rb@gid.co.ukhelp
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