Message-ID: <43F45F7A.8090606@ruault.com>
Date: Thu, 16 Feb 2006 12:18:18 +0100
From: Charles-Edouard Ruault <ce@ruault.com>
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To: Andrew Morton <akpm@osdl.org>
CC: Folkert van Heusden <folkert@vanheusden.com>, linux-kernel@vger.kernel.org
Subject: Re: [BUG] kernel 2.6.15.4: soft lockup detected on CPU#0!
References: <43EF8388.10202@ruault.com>	<20060215185120.6c35eca2.akpm@osdl.org>	<43F44978.2050809@ruault.com>	<20060216103619.GI30182@vanheusden.com> <20060216024625.1b5dc77b.akpm@osdl.org>
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Andrew Morton wrote:

>Folkert van Heusden <folkert@vanheusden.com> wrote:
>  
>
>>I noticed that altough -i says using dma, that -d tells me it really is
>> off.
>>    
>>
>
>Yup, `hdparm -i' tells you what the drive _can_ do, not what it's actually
>doing.
>
>  
>
here's what i have:

sudo /sbin/hdparm -d /dev/hdd
/dev/hdd:
 using_dma    =  1 (on)

sudo /sbin/hdparm -d /dev/hdc
/dev/hdc:
 using_dma    =  1 (on)

So it appears that both CDROM/DVDROM drives are using DMA, which
confirms what i was thinking (since the traceback i have is not the same
as the one Folker provided which clearly indicates that it happens
during a pio operation ).

-- 
Charles-Edouard Ruault
GPG key Id E4D2B80C

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