nanog mailing list archives
Re: Most energy efficient (home) setup
From: Douglas Otis <dotis () mail-abuse org>
Date: Wed, 18 Apr 2012 14:55:32 -0700
On 4/18/12 12:35 PM, Jeroen van Aart wrote:
Laurent GUERBY wrote: > Do you have reference to recent papers with experimental data about > non ECC memory errors? It should be fairly easy to do Maybe this provides some information: http://en.wikipedia.org/wiki/ECC_memory#Problem_background "Work published between 2007 and 2009 showed widely varying error rates with over 7 orders of magnitude difference, ranging from 10−10−10−17 error/bit·h, roughly one bit error, per hour, per gigabyte of memory to one bit error, per century, per gigabyte of memory.[2][4][5] A very large-scale study based on Google's very large number of servers was presented at the SIGMETRICS/Performance’09 conference.[4] The actual error rate found was several orders of magnitude higher than previous small-scale or laboratory studies, with 25,000 to 70,000 errors per billion device hours per megabit (about 3–10×10−9 error/bit·h), and more than 8% of DIMM memory modules affected by errors per year."
Dear Jeroen,In the work that led up to RFC3309, many of the errors found on the Internet pertained to single interface bits, and not single data bits. Working at a large chip manufacturer that removed internal memory error detection to foolishly save space, cost them dearly in then needing to do far more exhaustive four corner testing. Checksums used by TCP and UDP are able to detect single bit data errors, but may miss as much as 2% of single interface bit errors. It would be surprising to find memory designs lacking internal error detection logic.
Regards, Douglas Otis
Current thread:
- Re: Most energy efficient (home) setup, (continued)
- Re: Most energy efficient (home) setup Jimmy Hess (Apr 14)
- Re: Most energy efficient (home) setup Joe Greco (Apr 14)
- Re: Most energy efficient (home) setup Valdis . Kletnieks (Apr 15)
- Re: Most energy efficient (home) setup Charles Morris (Apr 15)
- Re: Most energy efficient (home) setup Joe Greco (Apr 15)
- Re: Most energy efficient (home) setup Jimmy Hess (Apr 15)
- Re: Most energy efficient (home) setup Laurent GUERBY (Apr 15)
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- Re: Most energy efficient (home) setup Mike (Apr 15)
- Re: Most energy efficient (home) setup Jimmy Hess (Apr 15)
- Re: Most energy efficient (home) setup Joe Greco (Apr 14)
- Re: Most energy efficient (home) setup Jimmy Hess (Apr 14)
- Re: Most energy efficient (home) setup Jeroen van Aart (Apr 18)
- Re: Most energy efficient (home) setup Douglas Otis (Apr 18)
- Re: Most energy efficient (home) setup Steven Bellovin (Apr 18)
- Re: Most energy efficient (home) setup Douglas Otis (Apr 19)
- Re: Most energy efficient (home) setup Steven Bellovin (Apr 19)
- Re: Most energy efficient (home) setup Luke S. Crawford (Apr 15)
- Re: Most energy efficient (home) setup Joe Greco (Apr 15)
- RE: Most energy efficient (home) setup Jamie Bowden (Apr 16)
- Re: Most energy efficient (home) setup Leo Bicknell (Apr 16)
- Re: Most energy efficient (home) setup Joe Greco (Apr 16)
- Re: Most energy efficient (home) setup Jeroen van Aart (Apr 17)