Date: Wed, 23 Sep 1998 09:39:27 +1000 From: Greg Wickham <gjw@deakin.edu.au> To: Doug Ledford <dledford@dialnet.net> Cc: aic7xxx Mailing List <AIC7xxx@FreeBSD.ORG> Subject: Re: Linux: Was reading past end of file fixed? Message-ID: <199809222339.JAA12387@hestia.its.deakin.edu.au> In-Reply-To: Your message of "Mon, 21 Sep 1998 21:24:01 EST." <36070A41.42422C91@dialnet.net>
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On 21-Sep-1998, at around 21:24, Doug Ledford wrote: ] I'm Cc:ing this to aic7xxx list because this test is fairly valuable at ] finding out these kinds of problems. To test for hardware bit flips related ] to heavy DMA load, I usually recommend running this script (you'll need at ] least roughly 50MB of free drive space on your /usr/src partition): ] ] 1. Get a linux-x.y.z.tar.gz tarball. ] 2. Put that tarball into /usr/src ] 3. Backup any existing /usr/src/linux directory to /usr/src/linux.save ] 4. Extract that linux-x.y.z.tar.gx file. ] 5. Move the new /usr/src/linux directory to /usr/src/linux.orig ] 6. Run the following shell script: ] ] #!/bin/sh ] cd /usr/src ] for i in 1 2 3 4 5 6 7 8 9 10 ] do ] tar -xzf linux-x.y.z.tar.gx ] diff -U 3 -rN linux.orig linux ] rm -fr linux ] done ] ] If that little shell script produces any visible output, then you have ] hardware problems. Good news and bad news. I ran the above and it worked perfectly (that is no output was generated). I upped the loop to 20 times. I ran it once in parallel. (And did the hard disk sound like a gieger counter at Chernobyl on a hot day :) ). Again, no output. However it *faulted* as soon as I started to read data from the CD rom. When I mean read, I extracted a 600M+ image. Funnying thing (as if this wasn't unfunny enough) was that the extracted image was fine. And there were no errors in the system log. Just the diff's failed. I can repeat this ad-infinitum. :( Is it my hardware? It is extremely repeatable, but doesn't happen as long as I don't use the SCSI cdrom. -Greg ------------------------------------------------------------------ Network Operations Center Manager Dr. Greg Wickham Information Technology Services ______________________________ Deakin University Voice: (+61 3) 5227 8844 Geelong VIC 3217 eMail: G.Wickham@deakin.edu.au Australia WWW: http://www.cm.deakin.edu.au/~gjw ------------------------------------------------------------------ ifiHadaDollArfoReveRytiMeapErsoNaskEdmeWhatThisBottOmliNeisAbouT:) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-aic7xxx" in the body of the message
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