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Thread: WL-HDD IDE Speed -- Could be faster?

  1. #1

    WL-HDD IDE Speed -- Could be faster?

    Hello,

    I have an ATA-100 drive in my WL-HDD and I suspect that it's running slower than 100MHz. Based on some other WL-HDD performance discussions, this may not matter in the grand scheme of things, but I'm still curious. I was sifting through the kernel log and early on it says:

    kernel: ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx

    Later, I see:

    kernel: ide0: BM-DMA at 0x0140-0x0147, BIOS settings: hdaMA, hdbio

    which suggests that my harddrive (hda) is actually using DMA and not PIO. So far so good. Later still I see:

    kernel: hda: 195371568 sectors (100030 MB), CHS=12161/255/63, UDMA(33)

    which suggests that I'm using UDMA (good) but only at 33MHz (bad). At the shell prompt, cat /proc/ide/hda/settings reports (among other things):

    name value min max mode
    ....
    current_speed 66 0 69 rw
    ....
    using_dma 1 0 1 rw

    Does this mean the harddrive is actually using UDMA66? Can I jack it up to 100 somehow?

    Thanks,
    Massi

  2. #2
    Join Date
    Apr 2004
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    I guess that any (U)DMA speed: 33, 66, 100 or 133 will give you the same performance and that the critical part of the performance is the (U)DMA/PIO setting. A harddisk with (U)DMA 33 speed will deliver far more data to the processor than the processor can handle.

  3. #3
    Use hdparm to adjust your harddisk settings... but you wont get any faster speed than 6-8 MB/s at all.
    hdparm is not in Oleg's firmware, so you have to get it via ipkg or search for it in the forum.

    Test your speed with: hdparm -t /dev/discs/disc0/disc

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