Date: Wed, 8 Jan 2003 15:34:56 +0100 From: Thierry Herbelot <thierry@herbelot.com> To: Mike Tancsa <mike@sentex.net>, Janet Sullivan <ciscogeek@cox.net>, freebsd-stable@FreeBSD.ORG Subject: Re: ATA corruption in DMA mode Message-ID: <200301081534.56606.thierry@herbelot.com> In-Reply-To: <5.2.0.9.0.20030108091446.05ae8730@marble.sentex.ca> References: <3E1C2EA6.18C86871@vzavenue.net> <5.2.0.9.0.20030108091446.05ae8730@marble.sentex.ca>
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Le Wednesday 08 January 2003 15:15, Mike Tancsa a écrit : > Can you boot with a 4.6 kernel now and test it again to confirm the problem > really does go away ? > > ---Mike > > At 07:05 AM 08/01/2003 -0700, Janet Sullivan wrote: > >P.S. I've seen absolutely no ata error messages (command timeout, > >etc.). > > > >Janet Sullivan wrote: > > > If I copy large (500 meg) files between directories with DMA on, the > > > copy becomes corrupt. If I turn DMA off and use PIO mode, the copy is [SNIP] The DMA may be more aggressive in its memory timings It took me some time to find out why disk copies of large files (typically CD-ROM ISO image files) went corrupt : I had two semi-broken SDRAM SIMMs. I could single out which SIMMs were bad with the "canonical" memory test : a string of "make buildworld", with different combinations of SIMMs (I even had to try : does this SIMM work when alone one a motherboard ?) HtH TfH PS : obviously, a broken SIMM should be broken for any release of FreeBSD To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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