Subject: Re: 2.6.1 "clock preempt"?
From: john stultz <johnstul@us.ibm.com>
To: timothy parkinson <t@timothyparkinson.com>
Cc: hauan@cmu.edu, Linux Kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <20040122200044.GA593@h00a0cca1a6cf.ne.client2.attbi.com>
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	 <20040122193704.GA552@h00a0cca1a6cf.ne.client2.attbi.com>
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Date: Thu, 22 Jan 2004 13:21:45 -0800
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On Thu, 2004-01-22 at 12:00, timothy parkinson wrote:
> su -c "/usr/sbin/hdparm /dev/hda"
> Password:
> 
> /dev/hda:
>  multcount    = 16 (on)
>  IO_support   =  1 (32-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  0 (off)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 65535/16/63, sectors = 156301488, start = 0
> 
> but...
> 
> su -c "/usr/sbin/hdparm -d1 /dev/hda"
> Password:
> 
> /dev/hda:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> 
> it's an 80gig western digital from about 2-3 years ago.

Its likely you need to enable support in the kernel for your IDE
controller, or your DMA on your controller isn't supported. 

thanks
-john

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