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    This is up with some updates

    Short notice development for Promise Ultra100 TX2 sponsored by
    Penguin Computer and again little/no help from Promise.

    This is a unique chipset that does setfeatures sensing of the transfer
    rates and thus it is counter to the standard Promise design. It does
    still use the pdc202xx.c chipset code, but much of it is skipped over to
    preserve the hidden settings calls. The one issue for this chipset is
    that it may not be ideal for hotswap as the unknown states are issues.

    DiskPerf /dev/hde
    Device: IBM-DTLA-307075 Serial Number: YSDYSFA5874
    LBA 0 DMA Read Test = 63.35 MB/Sec (3.95 Seconds)
    Outer Diameter Sequential DMA Read Test = 35.89 MB/Sec (6.97 Seconds)
    Inner Diameter Sequential DMA Read Test = 17.64 MB/Sec (14.17 Seconds)

    CR3's adjusted: for kernel transfer rates and conservative
    LBA 0 DMA Read Test = 85.52 MB/Sec
    Outer Diameter Sequential DMA Read Test = 48.45 MB/Sec
    Inner Diameter Sequential DMA Read Test = 23.81 MB/Sec

    There is about a 35%-40% under reporting of performance from kernel to
    user-space ioctl calls.


    Andre Hedrick
    Linux ATA Development

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