Dobai-Pataky Balint wrote:
> On Thu, 2003-12-11 at 22:27, Rune Maagensen wrote:
>
>> using_dma = 0 (off)
>
>
> try hdparm -i device, to see what modes are suported by hdd
>
/dev/hda:
Model=Maxtor 6Y080P0, FwRev=YAR41BW0, SerialNo=Y2Q5NXLE
Config={ Fixed }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
BuffType=DualPortCache, BuffSize=7936kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=160086528
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 udma0 udma1 udma2 udma3 udma4 *udma5 udma6
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive Supports : ataATA-1 ATA-2 ATA-3 ATA-4 ATA-5 ATA-6 ATA-7
I looks like the drive supports all modern modes.
> and a cat /proc/ide/piix for more info,
Well that doesn't exist on my system.
this does however:
hubble:/home/admin# less /proc/ide/ide0/hda/settings
name value min max mode
---- ----- --- --- ----
acoustic 0 0 254 rw
address 0 0 2 rw
bios_cyl 9964 0 65535 rw
bios_head 255 0 255 rw
bios_sect 63 0 63 rw
breada_readahead 8 0 255 rw
bswap 0 0 1 r
current_speed 0 0 70 rw
failures 0 0 65535 rw
file_readahead 124 0 16384 rw
init_speed 0 0 70 rw
io_32bit 0 0 3 rw
keepsettings 0 0 1 rw
lun 0 0 7 rw
max_failures 1 0 65535 rw
max_kb_per_request 128 1 255 rw
multcount 16 0 16 rw
nice1 1 0 1 rw
nowerr 0 0 1 rw
number 0 0 3 rw
pio_mode write-only 0 255 w
slow 0 0 1 rw
unmaskirq 0 0 1 rw
using_dma 0 0 1 rw
wcache 0 0 1 rw
> my opinion is you can safely turn on simple dma(hdparm -d1 device), you
> can only worry about udma modes (-X66 ->-X69), that's the only way i can
> get an irq timeout on the hdd.
>
Ok, thanks, but is there a performance penalty from running normal DMA compared to
UDMA, I know both the disk and chipset is capable?
TIA
Rune
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