Re: Abysmal PATA IDE performance

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Luca Tettamanti wrote:

On 11/9/06, Stephen Clark <[email protected]> wrote:
Luca Tettamanti wrote:

Stephen Clark <[email protected]> ha scritto:


Looking at the dmesg output I am a little confused, see comments below:
partial dmesg output follows:

SCSI subsystem initialized
libata version 2.00 loaded.
ata_piix 0000:00:1f.2: version 2.00
ata_piix 0000:00:1f.2: MAP [ P0 P2 IDE IDE ]
ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 19 (level, low) -> IRQ 233
PCI: Setting latency timer of device 0000:00:1f.2 to 64
ata1: SATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xFFA0 irq 14
scsi0 : ata_piix
Synaptics Touchpad, model: 1, fw: 6.1, id: 0xa3a0b3, caps: 0xa04713/0x10008
input: SynPS/2 Synaptics TouchPad as /class/input/input1
ATA: abnormal status 0x7F on port 0x1F7
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xFFA8 irq 15
scsi1 : ata_piix
ata2.00: ATA-6, max UDMA/100, 117210240 sectors: LBA48
ata2.00: ata2: dev 0 multi count 16
usb 2-2: new low speed USB device using uhci_hcd and address 3
ata2.01: ATAPI, max UDMA/33
ata2.00: configured for UDMA/33 <==== why isn't this 66 or 100 ?
===============****


This is your optical (CD/DVD) unit; I doubt that you can saturate that
link, even if your drive can do a sustained 16x transfer with a DVD it
will use only 21MBps. Your HD is using UDMA/100.
aren't the ata2.00: messages referring to my hard drive and the
ata2.01 messages referring to my optical drive?

ata2.00: ATA-6, max UDMA/100, 117210240 sectors: LBA48
ata2.00: ata2: dev 0 multi count 16

ata2.01: ATAPI, max UDMA/33

ata2.00: configured for UDMA/33 <==== why isn't this 66 or 100 ?
You're right, I misparsed your log. Probably Arjan is right about the wiring.

Luca
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Hi Luca,

The specs for the laptop say it supports ide 100MBps (Ultra DMA 5).
Datová propustnost k IDE:   100 MBps (Ultra DMA 5)

Steve


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