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    SubjectRe: Abysmal PATA IDE performance
    Arjan van de Ven wrote:

    >>>
    >>>
    >>>
    >>>
    >>Thanks all.
    >>
    >>Arjan, using combined_mode=libata and making a new ramdisk increased my
    >>xfer rate from 1.xx mb/sec to 28.xx mb/sec.
    >>
    >>
    >>
    >
    >ok that's getting somewhere
    >
    >
    >
    >>I am curious as to why my friends dell inspiron 8200 with a 1.8ghz p4
    >>and the same drive using the same drive with FC6 and the standard ide
    >>module gets 44 to 45 mb/sec.
    >>
    >>
    >
    >now it is going to come down to how you measure this....
    >
    >don't use hdparm, use something like tiobench (tiobench.sf.net);
    >another setting that might be different is that scsi normally turns the
    >write back cache off (safer for your data but slower) while IDE normally
    >leaves at at factory default (on for cheating on benchmarks).
    >For writes, this can easily explain the difference...
    >
    >
    >
    >
    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 ?
    ===============****
    usb 2-2: configuration #1 chosen from 1 choice
    input: Logitech USB-PS/2 Trackball as /class/input/input2
    input: USB HID v1.00 Mouse [Logitech USB-PS/2 Trackball] on
    usb-0000:00:1d.1-2
    ata2.01: configured for UDMA/33 <=========== is this related to the
    following 2 lines? ====
    Vendor: ATA Model: HTS721060G9AT00 Rev: MC3O
    Type: Direct-Access ANSI SCSI revision: 05
    SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
    sda: Write Protect is off
    sda: Mode Sense: 00 3a 00 00
    SCSI device sda: drive cache: write back
    SCSI device sda: 117210240 512-byte hdwr sectors (60012 MB)
    sda: Write Protect is off
    sda: Mode Sense: 00 3a 00 00
    SCSI device sda: drive cache: write back
    sda: sda1 sda2
    sd 1:0:0:0: Attached scsi disk sda
    Vendor: HL-DT-ST Model: DVDRAM GMA-4082N Rev: HJ02
    Type: CD-ROM ANSI SCSI revision: 05
    device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised:
    dm-devel@redhat.com
    kjournald starting. Commit interval 5 seconds

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