linux-kernel - Re: Abysmal PATA IDE performance

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Message-ID: <4553A8AC.2090805@seclark.us>
Date:	Thu, 09 Nov 2006 17:16:12 -0500
From:	Stephen Clark <Stephen.Clark@...lark.us>
To:	Luca Tettamanti <kronos.it@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Abysmal PATA IDE performance

Luca Tettamanti wrote:

>On 11/9/06, Stephen Clark <Stephen.Clark@...lark.us> wrote:
>  
>
>>Luca Tettamanti wrote:
>>
>>    
>>
>>>Stephen Clark <Stephen.Clark@...lark.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.
>>>      
>>>
>>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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