Hi,

my SAMSUNG 250GB drive connected to HPT374 RAID bus controller (SATA) is
only working at UDMA 33.

I am using
HPT36X/37X chipset support (*).

And here is what dmesg says:

ide5: BM-DMA at 0xc008-0xc00f, BIOS settings: hdk:DMA, hdl:pio
hdk: SAMSUNG SP2504C, ATA DISK drive
hdk: max request size: 1024KiB
hdk: 488397168 sectors (250059 MB) w/8192KiB Cache, CHS=30401/255/63,
UDMA(33)
hdk: cache flushes supported
 hdk:

lspci:

02:05.0 RAID bus controller: Triones Technologies, Inc. HPT374 (rev 07)
Subsystem: Triones Technologies, Inc.: Unknown device 0001
Flags: bus master, 66Mhz, medium devsel, latency 120, IRQ 17
I/O ports at 9c00 [size=8]
I/O ports at a000 [size=4]
I/O ports at a400 [size=8]
I/O ports at a800 [size=4]
I/O ports at ac00 [size=256]
Expansion ROM at e0020000 [disabled] [size=128K]
Capabilities: [60] Power Management version 2

02:05.1 RAID bus controller: Triones Technologies, Inc. HPT374 (rev 07)
Subsystem: Triones Technologies, Inc.: Unknown device 0001
Flags: bus master, 66Mhz, medium devsel, latency 120, IRQ 17
I/O ports at b000 [size=8]
I/O ports at b400 [size=4]
I/O ports at b800 [size=8]
I/O ports at bc00 [size=4]
I/O ports at c000 [size=256]
Capabilities: [60] Power Management version 2


Trying to set UDMA 3-5 directly doesn't work:

dmesg:

hdk: Speed warnings UDMA 3/4/5 is not functional.


hdparm -t /dev/hdk

/dev/hdk:
 Timing buffered disk reads:   42 MB in  3.06 seconds =  13.74 MB/sec

Does anyone have a solution to fix this bottleneck?

regards,

Lukas

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