Poor hd-performance (ALI M15x3-Chipset)

[Andre Duffeck <andre@duffeck.de>]

hello,

i'm experiencing extremely poor performance of my harddisk. it is a
laptop-disk, but it should be faster, i think.

laptop:/usr/src/linux/linux-2.6.9# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   1248 MB in  2.00 seconds = 623.16 MB/sec
 Timing buffered disk reads:   14 MB in 10.85 seconds =   1.29 MB/sec

laptop:/home/andre# hdparm /dev/hda

/dev/hda:
 multcount    =  0 (off)
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 16383/255/63, sectors = 30005821440, start = 0

playing with the settings did not help.

laptop:/usr/src/linux/linux-2.6.9# hdparm -X66 /dev/hda
		/dev/hda:
		 setting xfermode to 66 (UltraDMA mode2)
laptop:/home/andre# hdparm -c1 /dev/hda
		/dev/hda:
		 setting 32-bit IO_support flag to 1
		 IO_support   =  1 (32-bit)

laptop:/home/andre# hdparm -t /dev/hda
		/dev/hda:
		 Timing buffered disk reads:   14 MB in 10.75 seconds =   1.30 MB/sec

here some more information:
dmesg:
ALI15X3: IDE controller at PCI slot 0000:00:10.0
ACPI: PCI interrupt 0000:00:10.0[A]: no GSI
ALI15X3: chipset revision 196
ALI15X3: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0x2480-0x2487, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0x2488-0x248f, BIOS settings: hdc:DMA, hdd:pio
Probing IDE interface ide0...
hda: FUJITSU MHR2030AT, ATA DISK drive

lspci:
0000:00:10.0 IDE interface: ALi Corporation M5229 IDE (rev c4)

Can anybody guess what's wrong here?

thank you,

André