apalling IDE performance on ds20
I'm getting really slow IDE performance on my ds20.
Kernel is 2.6.8-2-generic 2.6.8-9.
Disk is a Maxtor 6Y160P0 160G.
Machine is a ds20, using the onboard CY82C693 controller:
CY82C693: chipset revision 0
CY82C693: not 100% native mode: will probe irqs later
CY82C693U driver v0.34 99-13-12 Andreas S. Krebs (email@example.com)
ide0: BM-DMA at 0x8400-0x8407, BIOS settings: hda:DMA, hdb:pio
PCI: Enabling device: (0000:00:05.2), cmd 7
ide1: BM-DMA at 0x8408-0x840f, BIOS settings: hdc:DMA, hdd:DMA
hda: Maxtor 6Y160P0, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: max request size: 1024KiB
hda: 320173056 sectors (163928 MB) w/7936KiB Cache, CHS=19929/255/63, (U)DMA
hdparm shows it using dma:
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 = 19929/255/63, sectors = 320173056, start = 0
(setting the multcount to 16, the unmaskirq to on, and io_support to
32bit doesn't help).
hdparm -Tt /dev/hda
Timing cached reads: 900 MB in 2.01 seconds = 448.47 MB/sec
Timing buffered disk reads: 12 MB in 3.53 seconds = 3.40 MB/sec
I'm sure this controller and disk combination should do a little better
than that :)