sslug-teknik team mailing list archive

[Anders Nielsen <anders@xxxxxxxxxxxxxx>]

Hej gruppe,

Jeg har en disk i en soekris 4801'er - disk-access er pæææænnttt langsom, 
så jeg ville se om ikke jeg ku komme til at aktivere DMA:

> # hdparm -d1 /dev/hda
>
>  /dev/hda:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)

 - men nej. Hvorfor ikke? Den skulle understøtte det?

Lidt mere info:
> # hdparm /dev/hda
>
> /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 = 40007761920, start = 0

> # hdparm -i /dev/hda>
> /dev/hda:
>
>  Model=IC25N040ATCS05-0, FwRev=CS4OA63A, SerialNo=CLP425F4GGTMVA
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
>  BuffType=DualPortCache, BuffSize=7898kB, MaxMultSect=16, MultSect=16
>  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78140160
>  IORDY=on/off, tPIO={min:240,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
>  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
>  Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3:
>
>  * signifies the current active mode


 - og ja, den ER langsom:

> # hdparm -tT /dev/hda
>
> /dev/hda:
>  Timing cached reads:   192 MB in  2.01 seconds =  95.39 MB/sec
>  Timing buffered disk reads:   10 MB in  3.28 seconds =   3.05 MB/sec


Hvad bør jeg kunne smide afsted til den disk, for at få lidt mere 
performance ud af den?

/a