Date: Tue, 27 Jun 2006 01:09:03 +0200 From: =?ISO-8859-1?Q?Thomas_Nystr=F6m?= <thn@saeab.se> To: "M.Hirsch" <M.Hirsch@hirsch.it> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD 6.x CVSUP today crashes with zero load ... Message-ID: <44A0690F.8040005@saeab.se> In-Reply-To: <44A057AD.7050700@hirsch.it> References: <E1FuYsL-000HT3-H2@dilbert.firstcallgroup.co.uk> <20060626100949.G24406@fledge.watson.org> <20060626081029.L1114@ganymede.hub.org> <20060626140333.M38418@fledge.watson.org> <20060626235355.Q95667@atlantis.atlantis.dp.ua> <44A04FD2.1030001@hirsch.it> <20060626212654.GB93703@freebie.xs4all.nl> <44A0538E.6090906@gmx.de> <20060626214535.GA94015@freebie.xs4all.nl> <44A057AD.7050700@hirsch.it>
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M.Hirsch wrote: > Any hardware showing ECC errors should be replaced asap.. No. ALL memory will sooner or later show single bit error. Several years ago I was checking this during my work at Ericsson. There was a discussion if ECC should be present in the GSM-base-stations or not. I had a special test-software running in several units looking for soft-errors. Soft errors are bits that are flipped spontaneously in the memory. When the bit are rewritten it will work OK again, no permanent damage to the memory and no need to replace the memory. During my test period (I think it was 6-8 monthes) I saw four occasions when this occured (total amount of memory 96 MB). ECC is intended to fix this: It will correct a single bit fault and allow the system to contiune uninterrupted. Of course this event should be logged and if it occurs several times at the same place then it is time to replace the memory. Of course memory should be better these days but.... knock on wood.... /thn [20 years as HW-designer, FreeBSD since 3.0] -- --------------------------------------------------------------- Svensk Aktuell Elektronik AB Thomas Nyström Box 10 Phone: +46 8 35 92 85 S-191 21 Sollentuna Fax: +46 8 35 92 86 Sweden Email: thn@saeab.se ---------------------------------------------------------------
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