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    SubjectRe: 2.6.0 performance problems
    Thomas,

    Have you tried lowering the read ahead in 2.6 to 8.

    I don't know what you are doing with your workload but it is possible
    that you are transferring useless data and clogging the plumbing a bit.

    Cheers,
    Dave



    Thomas Molina wrote:

    >It certainly looks like DMA is enabled. Under 2.4 I get:
    >
    >[root@lap root]# hdparm /dev/hda
    >
    >/dev/hda:
    > multcount = 16 (on)
    > IO_support = 1 (32-bit)
    > unmaskirq = 1 (on)
    > using_dma = 1 (on)
    > keepsettings = 0 (off)
    > readonly = 0 (off)
    > readahead = 8 (on)
    > geometry = 2584/240/63, sectors = 39070080, start = 0
    >
    >
    >Under 2.6 I get:
    >
    >[root@lap root]# hdparm /dev/hda
    >
    >/dev/hda:
    > multcount = 16 (on)
    > IO_support = 1 (32-bit)
    > unmaskirq = 1 (on)
    > using_dma = 1 (on)
    > keepsettings = 0 (off)
    > readonly = 0 (off)
    > readahead = 256 (on)
    > geometry = 38760/16/63, sectors = 39070080, start = 0
    >
    >


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