From: Larry McVoy <lm@bitmover.com>
To: jlnance@unity.ncsu.edu
Cc: linux-kernel@vger.kernel.org
Subject: Re: Transparent compression in the FS
Date: Thu, 16 Oct 2003 18:59:12 -0700 [thread overview]
Message-ID: <20031017015912.GA28158@work.bitmover.com> (raw)
In-Reply-To: <20031017013245.GA6053@ncsu.edu>
On Thu, Oct 16, 2003 at 09:32:45PM -0400, jlnance@unity.ncsu.edu wrote:
> Lots of machines dont have ECC ram and seem to work reasonably well.
That's because you have two choices in RAM today: ECC and straight memory,
no parity. So you never know that there is a problem until /bin/ls starts
core dumping.
BK users catch memory errors all the time because BK checksums the data.
Even with a very (!) weak checksum we see it (we have retained, perhaps
stupidly, backwards compat with SCCS' 16 bit checksum - not CRC). One
nice thing about the weak checksum is that we can tell if it is a memory
from looking at the got/wanted values for the checksum, single bit errors
are obvious. It happens so frequently that we have learned to recognize
it and tell the customer within seconds of getting the mail.
--
---
Larry McVoy lm at bitmover.com http://www.bitmover.com/lm
next prev parent reply other threads:[~2003-10-17 1:59 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-14 20:30 Transparent compression in the FS Josh Litherland
2003-10-15 13:33 ` Erik Mouw
2003-10-15 13:45 ` Josh Litherland
2003-10-15 13:50 ` Nikita Danilov
2003-10-15 14:27 ` Erik Mouw
2003-10-15 14:33 ` Nikita Danilov
2003-10-15 15:54 ` Richard B. Johnson
2003-10-15 16:21 ` Nikita Danilov
2003-10-15 17:19 ` Richard B. Johnson
2003-10-15 17:37 ` Andreas Dilger
2003-10-15 17:48 ` Dave Jones
2003-10-15 18:19 ` Richard B. Johnson
2003-10-15 18:06 ` Hans Reiser
2003-10-17 12:51 ` Edward Shushkin
2003-10-15 16:04 ` Erik Mouw
2003-10-15 17:24 ` Josh Litherland
2003-10-15 18:53 ` Erik Bourget
2003-10-15 19:03 ` Geert Uytterhoeven
2003-10-15 19:14 ` Valdis.Kletnieks
2003-10-15 19:24 ` Geert Uytterhoeven
2003-10-15 18:54 ` root
2003-10-16 2:11 ` Chris Meadors
2003-10-16 3:01 ` Shawn
2003-10-15 14:47 ` Erik Bourget
2003-10-15 15:05 ` Nikita Danilov
2003-10-15 15:06 ` Erik Bourget
2003-10-15 21:36 ` Tomas Szepe
2003-10-16 8:04 ` Ville Herva
2003-10-17 1:32 ` Eric W. Biederman
2003-10-15 15:13 ` Jeff Garzik
2003-10-15 21:00 ` Christopher Li
2003-10-16 16:29 ` Andrea Arcangeli
2003-10-16 16:41 ` P
2003-10-16 17:20 ` Jeff Garzik
2003-10-16 23:12 ` jw schultz
2003-10-17 8:03 ` John Bradford
2003-10-17 14:53 ` Eli Carter
2003-10-17 15:27 ` John Bradford
2003-10-17 16:22 ` Eli Carter
2003-10-17 17:15 ` John Bradford
2003-10-16 17:10 ` Jeff Garzik
2003-10-16 17:41 ` Andrea Arcangeli
2003-10-16 17:29 ` Larry McVoy
2003-10-16 17:49 ` Val Henson
2003-10-16 21:02 ` Jeff Garzik
2003-10-16 21:18 ` Chris Meadors
2003-10-16 21:25 ` Jeff Garzik
2003-10-16 21:33 ` Davide Libenzi
2003-10-17 3:47 ` Mark Mielke
2003-10-17 14:31 ` Jörn Engel
2003-10-16 23:04 ` jw schultz
2003-10-16 23:30 ` Jeff Garzik
2003-10-16 23:58 ` jw schultz
2003-10-16 23:53 ` David Lang
2003-10-17 1:19 ` Jeff Garzik
2003-10-17 0:45 ` Christopher Li
2003-10-17 1:16 ` Jeff Garzik
2003-10-17 1:32 ` jlnance
2003-10-17 1:47 ` Eric Sandall
2003-10-17 8:11 ` John Bradford
2003-10-17 17:53 ` Eric Sandall
2003-10-17 13:07 ` jlnance
2003-10-17 14:16 ` Jeff Garzik
2003-10-17 15:06 ` Valdis.Kletnieks
2003-10-17 1:49 ` Davide Libenzi
2003-10-17 1:59 ` Larry McVoy [this message]
2003-10-17 2:19 ` jw schultz
2003-10-17 9:44 ` Pavel Machek
2003-10-17 12:33 ` jlnance
2003-10-17 18:23 ` jw schultz
2003-10-27 2:08 ` Mike Fedyk
2003-10-27 2:15 ` jw schultz
2003-10-27 2:22 ` Mike Fedyk
2003-10-27 2:45 ` jw schultz
2003-10-16 18:28 ` John Bradford
2003-10-16 18:31 ` Robert Love
2003-10-16 20:18 ` Jeff Garzik
2003-10-16 18:43 ` Muli Ben-Yehuda
2003-10-16 18:56 ` Richard B. Johnson
2003-10-16 19:00 ` Robert Love
2003-10-16 19:27 ` John Bradford
2003-10-16 19:03 ` John Bradford
2003-10-16 19:20 ` Richard B. Johnson
2003-10-17 13:16 ` Ingo Oeser
2003-10-16 23:20 ` jw schultz
2003-10-17 14:47 ` Eli Carter
2003-10-16 8:27 ` tconnors+linuxkernel1066292516
2003-10-17 10:55 ` Ingo Oeser
2003-10-15 16:25 ` David Woodhouse
2003-10-15 16:56 ` Andreas Dilger
2003-10-15 17:44 ` David Woodhouse
[not found] <GTJr.60q.17@gated-at.bofh.it>
[not found] ` <GU2N.6v7.17@gated-at.bofh.it>
[not found] ` <GVBC.Ep.23@gated-at.bofh.it>
[not found] ` <Hjkq.3Al.1@gated-at.bofh.it>
[not found] ` <Hkgx.4Vu.7@gated-at.bofh.it>
[not found] ` <HkA0.5lh.9@gated-at.bofh.it>
[not found] ` <HnxT.3BB.27@gated-at.bofh.it>
2003-10-17 8:15 ` Ihar 'Philips' Filipau
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