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On Tuesday 19 August 2003 15:21, Robert Young wrote:
> /dev/hdX it your device that wish to enable dma on.
>
> do a hdparm -i /dev/hdX to be sure that you can enable dma.
>
> e.g.:
>
> angus root # hdparm -i /dev/hda
>
> /dev/hda:
>
> Model=QUANTUM BIGFOOT TS12.7A, FwRev=A21.0G00, SerialNo=381906129356
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
> BuffType=DualPortCache, BuffSize=418kB, MaxMultSect=16, MultSect=off
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=25075008
> 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
> AdvancedPM=no WriteCache=enabled
> Drive conforms to: ATA/ATAPI-4 T13 1153D revision 15: 1 2 3 4
>
> * signifies the current active mode
>
> is my drive.
>
> DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
>
> shows me that the dive supports dma.
>
> UDMA modes: udma0 udma1 *udma2
>
> Shows me that it actually supports UDMA and is using udma2 mode.
It seems it supports DMA and UDMA and that iti is enabled:
# hdparm -i /dev/hda
[...]
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
[...]
and
# hdparm -i /dev/hdb
[...]
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
[...]
So, what may be wrong then ? (I didn't enable anything on the HDs yet)
> hdparm -d 1 /dev/hdX
> enables DMA)
> hdparm -d1 -A1 -m16 -u1 -a64 /dev/hdX
> enables DMA and other safe performance-enhancing options)
> hdparm -X66 /dev/hdX
> force-enables Ultra-DMA -- dangerous -- may cause some drives to mess
> up)
>
>
> Rob
>
> Pupeno wrote:
> > When I start my computer I always get this message:
> > ******************************************************
> > * Warning: The dma on your hard drive is turned off. *
> > * This may really slow down the fsck process. *
> > ******************************************************
> > How do I enable DMA ?
> > Thanks.
Thanks.
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