Re: Abysmal PATA IDE performance

[Stephen Clark <Stephen.Clark@seclark.us>]

Luca Tettamanti wrote:

>Stephen Clark <Stephen.Clark@seclark.us> 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.
>
>Forcing the interface to a higher speed may lead to CRC errors when
>using the drive.
>
>Luca
>  
>
Hi Luca,

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 ?
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