Date: Thu, 16 Feb 2006 11:36:19 +0100
From: Folkert van Heusden <folkert@vanheusden.com>
To: Charles-Edouard Ruault <ce@ruault.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [BUG] kernel 2.6.15.4: soft lockup detected on CPU#0!
Message-ID: <20060216103619.GI30182@vanheusden.com>
References: <43EF8388.10202@ruault.com> <20060215185120.6c35eca2.akpm@osdl.org>
	<43F44978.2050809@ruault.com>
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> From what i understand it will fix the problem only if the drive is in
> PIO mode, which is the case for  Folkert van Heusden, who reported the
> same BUG output.
> However it does not appear that my cdrom drives are using PIO, from the
> logs i have they're supposed to use DMA :
> >Feb 12 19:37:12 ruault kernel: hdc: ATAPI 40X CD-ROM CD-R/RW drive,2048kB Cache, DMA
> > Feb 12 19:37:12 ruault kernel: Uniform CD-ROM driver Revision: 3.20
> > Feb 12 19:37:12 ruault kernel: hdd: ATAPI 32X DVD-ROM DVD-R CD-R/RW
> > drive, 2048kB Cache, UDMA(33)
> sudo /sbin/hdparm -i /dev/hdc
> /dev/hdc:
>  DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2

Try /sbin/hdparm -d /dev/hdc
and see if it returns "using_dma = 1 (on)".
I noticed that altough -i says using dma, that -d tells me it really is
off.


Folkert van Heusden

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