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    SubjectRe: PATCH: Fix broken PIO with libata
    On 5/16/06, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
    > The revaldiation in 2.6.17-rc has broken support for PIO only devices.
    > This is fairly unusual in the SATA world but showed up rather more
    > promptly with the added PATA drivers.

    Excellent; this seems to have solved my oops on CF card insertion problem. :)

    However, I still have a problem with pata_pcmcia (that I actually
    experienced also with the ide-cs driver) where sustained reading or
    writing to the CF card spikes the CPU with nearly 100% system time.
    Here's a few seconds of 'vmstat 5' with a 'cat /dev/sdb > /dev/null'
    in the middle of it:

    procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
    r b swpd free buff cache si so bi bo in cs us sy id wa
    1 1 0 502608 13304 254740 0 0 164 42 1089 618 7 2 85 5
    1 1 0 495440 20472 254740 0 0 1434 7 1078 1079 1 95 0 4
    1 1 0 487264 28664 254740 0 0 1638 8 1073 1063 1 95 0 4
    1 1 0 479940 35832 254740 0 0 1434 50 1077 1087 1 95 0 4
    1 1 0 472320 43000 254740 0 0 1434 15 1078 1093 10 86 0 4
    1 1 0 465104 50168 254740 0 0 1434 56 1077 1053 6 90 0 4
    1 1 0 456944 58360 254740 0 0 1638 8 1072 1063 1 94 0 5
    1 1 0 449744 65528 254740 0 0 1434 3 1073 1069 1 94 0 5
    1 1 0 441600 73720 254740 0 0 1638 5 1072 1071 1 95 0 4
    1 1 0 434020 80888 254740 0 0 1434 0 1074 1087 11 85 0 4
    0 0 0 428896 86008 254740 0 0 1024 3 1184 1313 4 83 11 3
    0 0 0 428896 86008 254740 0 0 0 5 1105 1057 1 0 98 0


    --
    Kevin 'radsaq' Radloff
    radsaq@gmail.com
    http://thesaq.com/
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