[Nelug] Activating DMA on a Dell Optiplex

[Andy]

Is Plun 'n' Play enabled in the BIOS?

----- Original Message ----- 
From: "Martin Ward" <Martin.Ward at durham.ac.uk>
To: <nelug at mailman.lug.org.uk>
Sent: Monday, February 10, 2003 5:06 PM
Subject: [Nelug] Activating DMA on a Dell Optiplex



I have a new Dell Optiplex GX260 which I have installed Mandrake 9.0 on.
I noticed I was getting poor disk performance, so I had a look with hdparm
and found that DMA wasn't set. Trying to set DMA gives this error:

# hdparm -d1 /dev/hda

/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
#


When I boot into Linux, I get this message:

PCI: Device 00:1f.1 not available because of resource collisions

Device 00:1f.1 happens to be the IDE interface (an Intel 82801DB 1CH4 IDE)
What does "resource collisions" mean?

The disk is a Western Digital WDC WD800BB-75CAA0, ATA DISK drive
and the kernel is  2.4.19-16mdk

Any suggestions?

-- 
Martin

Martin.Ward at durham.ac.uk http://www.cse.dmu.ac.uk/~mward/ Erdos number: 4
G.K.Chesterton web site: http://www.cse.dmu.ac.uk/~mward/gkc/


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