Soltek sl-75drv4 dma problems....

["D.J. Bolderman" <dick@bolderman.xs4all.nl>]

Hi all,

I'm having some performance issues with this mb. I'm using a ata100
7400rpm ibm desktar hdd and hdparm -t /dev/hda shows:

'Timing buffered disk reads: 64 MB in 10.19 seconds = 6.28 MB/sec' 

This is too slow for what I've seen from other people.

hdparm -iv /dev/hda shows:

dev/hda:
 multcount    = 16 (on)
 I/O support  =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  0 (off)
 keepsettings =  1 (on)
 nowerr       =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 5005/255/63, sectors = 80418240, start = 0

 Model=IC35L040AVER07-0, FwRev=ER4OA44A, SerialNo=SXPTXFP7901
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
 BuffType=DualPortCache, BuffSize=1916kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=80418240
 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 udma0 udma1 udma2 udma3 udma4 *udma5 
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive Supports : ATA/ATAPI-5 T13 1321D revision 1 : ATA-2 ATA-3 ATA-4
ATA-5 

 busstate     =  1 (on)


So, dma is turned off. Logical idea would be hdparm -d1 /dev/hda, but
that gives the error message:

HDIO_SET_DMA failed: Operation not permitted

I've enabled the dma option in my kernel but it seems it's not used at
all...

Does anybody have a clue how to fix this ?

The board uses a VIA Apollo KT266A chipset.

Thanks,
Dick




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