HDIO_SET_DMA failed: Operation not permitted

[Biswajit Nayak]

No I do not think i did with nodma . Here is the
output of 

[root at localhost ocsperf]# cat /proc/cmdline
ro root=/dev/VolGroup00/LogVol00 rhgb quiet

2. How to make sure that the controller/drive does not
permit dma 
?

Thanks 
Biswajit


--- Rick Stevens <rstevens at vitalstream.com> wrote:

> On Fri, 2006-01-27 at 16:42 -0800, Biswajit Nayak
> wrote:
> > Hi Experts, 
> >    I want to enable the DMA on my linux server. I
> got
> > the following error "HDIO_SET_DMA failed:
> Operation
> > not permitted ". Any take on this ? 
> > 
> >  [root at localhost ocsperf]# /sbin/hdparm -d1
> /dev/hda
> > 
> > /dev/hda:
> >  setting using_dma to 1 (on)
> >  HDIO_SET_DMA failed: Operation not permitted
> >  using_dma    =  0 (off)
> > [root at localhost ocsperf]#
> 
> Did you boot the system with "nodma" set?  Check the
> output of
> "cat /proc/cmdline" to see.  If you did, you'll have
> to reboot the
> system WITHOUT that option.
> 
> It's also possible that your controller (or drive)
> doesn't permit DMA.
> 
>
----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer    
> rstevens at vitalstream.com -
> - VitalStream, Inc.                      
> http://www.vitalstream.com -
> -                                                   
>                 -
> -   "Do you suffer from long-term memory loss?"  "I
> don't remember"  -
> -                            -- Chumbawumba,
> "Amnesia" (TubThumping) -
>
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