dma

[ponzio]

i'm trying to activate dma for my disk but

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ponzio # hdparm -d1 /dev/hdb


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

the module for my chipset

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0000:00:0f.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)

is already loaded

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ponzio # lsmod
Module                  Size  Used by
tun                     7424  0
via82cxxx              11804  0 [permanent]
snd_via82xx            23300  3
fglrx                 229596  9
sk98lin               165096  1

where' the trick?

[adaptr]

Does the disk support DMA ?

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hdparm -i /dev/hdb

Have you enabled all the relevant DMA settings in the kernel config ?

[ponzio]

Does the disk support DMA ?

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ponzio # hdparm -i /dev/hdb

/dev/hdb:

 Model=Maxtor 6Y120L0, FwRev=YAR41BW0, SerialNo=Y3NKD7VE
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=240121728
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 *mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 udma6 
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: (null): 

 * signifies the current active mode

Have you enabled all the relevant DMA settings in the kernel config ?

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ponzio root # grep DMA /usr/src/linux/.config
CONFIG_GENERIC_ISA_DMA=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
# CONFIG_BLK_DEV_IDEDMA_FORCED is not set
CONFIG_IDEDMA_PCI_AUTO=y
# CONFIG_IDEDMA_ONLYDISK is not set
CONFIG_BLK_DEV_IDEDMA=y
# CONFIG_IDEDMA_IVB is not set
CONFIG_IDEDMA_AUTO=y

I think it's ok, or not?
thanks for your attention.

[adaptr]

That's Multiword DMA, not UltraDMA.
Check your BIOS settings.

Or else read the output of dmesg from the LiveCD very closely for any clues.

[jvlik]

I've the same disk.
It works fine until UDMA5 not if Bios is set to Auto or the UDMA6 option is chosen manually.

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/dev/hdb:

 Model=Maxtor 6Y120L0, FwRev=YAR41BW0, SerialNo=Y36G1ZWE
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=240121728
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma6
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: (null):

 * signifies the current active mode

If I put UDMA6 the bootloader isn't able to start and the ide0 is reset when the disck is mounted.

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# grep DMA /usr/src/linux/.config 
CONFIG_GENERIC_ISA_DMA=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
# CONFIG_BLK_DEV_IDEDMA_FORCED is not set
CONFIG_IDEDMA_PCI_AUTO=y
# CONFIG_IDEDMA_ONLYDISK is not set
# CONFIG_IDEDMA_PCI_WIP is not set
CONFIG_BLK_DEV_ADMA=y
CONFIG_BLK_DEV_IDEDMA=y
# CONFIG_IDEDMA_IVB is not set
CONFIG_IDEDMA_AUTO=y
# CONFIG_DMA_NONPCI is not set
CONFIG_SCSI_SYM53C8XX_DMA_ADDRESSING_MODE=1
# CONFIG_IEEE1394_SBP2_PHYS_DMA is not set

Bye