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SubjectVIA_IDE vt8235 is not using full speed

i am wondering, why my Seagate ST3120023A is not using UDMA100
as it should. The system bios displayed UDMA100, but /proc/ide/via
says 88MB/s. I have got an 80pin UDMA-133 cable to the harddisk.

Bye, claas


# dmesg
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with
VP_IDE: IDE controller at PCI slot 0000:00:11.1
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with
VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci0000:00:11.1
ide0: BM-DMA at 0xdc00-0xdc07, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xdc08-0xdc0f, BIOS settings: hdc:DMA, hdd:pio
hda: ST3120023A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hdc: LITE-ON LTR-12101B, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
hda: max request size: 128KiB
hda: host protected area => 1
hda: 234441648 sectors (120034 MB) w/2048KiB Cache, CHS=232581/16/63, UDMA(100)
/dev/ide/host0/bus0/target0/lun0: p1 p2
hdc: ATAPI 32X CD-ROM CD-R/RW drive, 2048kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12

$ cat /proc/ide/via
----------VIA BusMastering IDE Configuration----------------
Driver Version: 3.37
South Bridge: VIA vt8235
Revision: ISA 0x0 IDE 0x6
Highest DMA rate: UDMA133
BM-DMA base: 0xdc00
PCI clock: 33.3MHz
Master Read Cycle IRDY: 0ws
Master Write Cycle IRDY: 0ws
BM IDE Status Register Read Retry: yes
Max DRDY Pulse Width: No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush: yes yes
End Sector FIFO flush: no no
Prefetch Buffer: yes yes
Post Write Buffer: yes yes
Enabled: yes yes
Simplex only: no no
Cable Type: 80w 80w
Transfer Mode: UDMA PIO DMA PIO
Address Setup: 120ns 120ns 120ns 120ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 330ns 90ns 330ns
Data Recovery: 30ns 270ns 30ns 270ns
Cycle Time: 22ns 600ns 120ns 600ns
Transfer Rate: 88.8MB/s 3.3MB/s 16.6MB/s 3.3MB/s

# hdparm -i /dev/hda

Model=ST3120023A, FwRev=3.33, SerialNo=3KA1ERGQ
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=234441648
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=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 2: 1 2 3 4 5 6

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