hdd not accepting dma mode

[Tom Callahan]

I would ensure that the correct IDE modules are being loaded. If not,
you may want to load those correct modules, and then retry.

If using the incorrect IDE modules, hdparm settings won't apply, as you
are seeing.

Thanks,

Tom Callahan
TESSCO Technologies
(443)-506-6216
callahant at tessco.com

A real engineer only resorts to documentation when the keyboard dents on the forehead get too noticeable.



Vladimir Kosovac wrote:

>Hi all. Just installed RHEL 4 ES (update 2) on a laptop that used to run FC4
>and FC5 rawhide really nice. With Enterprise however, hda won't turn on DMA
>mode and reads are extremelly slow:
>_________________________________________________________
>hdparm -T /dev/hda
>
>/dev/hda:
> Timing cached reads:   1888 MB in  2.00 seconds = 942.26 MB/sec
>----------------------------------------------------------------------------------------------------
>hdparm -t /dev/hda
>
>/dev/hda:
> Timing buffered disk reads:    4 MB in  3.81 seconds =   1.05 MB/sec
>(!!!!!!!!)
>------------------------------------------------------------------------------------------------------------------
>
>If I try
>
>hdparm -d1 /dev/hda
>
>I get the following error:
>
>/dev/hda:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma    =  0 (off)
>
>I've done a bit of Googling and searched bugzilla but haven't found anything
>useful. Can someone point me in the rigth direction? Below is info that may
>help:
>
>OS: 2.6.9-22.0.1.EL (32 bit) (up-to-date)
>CPU: AMD Turion(tm) 64
>IDE: 00:14.1 IDE interface: ATI Technologies Inc Standard Dual Channel PCI
>IDE Controller ATI
>HDD: /dev/hda:
> multcount    = 16 (on)
> IO_support   =  0 (default 16-bit)
> unmaskirq    =  0 (off)
> using_dma    =  0 (off)
> keepsettings =  0 (off)
> readonly     =  0 (off)
> readahead    = 256 (on)
> geometry     = 65535/16/63, sectors = 60011642880, start = 0
>
> Model=TOSHIBA MK6025GAS, FwRev=KA201A, SerialNo=85GY4091S
> Config={ Fixed } ===> /* This is a bit of a worry */
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=48
> BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=16
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=117210240
> IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
> PIO modes:  pio0 pio1 pio2 pio3 pio4
> DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
> AdvancedPM=yes: unknown setting WriteCache=enabled
> Drive conforms to: device does not report version: ===> /* This too */
> * signifies the current active mode
>================================================================
>Appologies for a novel in place of an email.
>
>Cheers, V
>  
>