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    SubjectIDE DMA slower in 2.3.99pre3 than in 2.2.14 and in 2.0.36
    According to both hdparm and 'dd'.

    Results, in MB/sec, for hdparm:

    buffer cache reads buffered disk reads
    2.2.14 multcount=0 36.26 10.58
    2.2.14 multcount=8 36.36 10.27

    2.3.99pre3 multcount=0 36.99 8.11
    2.3.99pre3 multcount=8 36.89 8.86

    2.3.99pre3 idebus=66 37.21 8.13
    2.3.99pre3 idebus=66 36.78 8.65

    More - fishing in my old e-mail I can see that in 2.0.36 I used to
    be able to run dd if=/dev/hda of=/dev/null bs=4096 count=16384 in

    0.04user 1.90system 0:06.42elapsed 30%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (81major+11minor)pagefaults 0swaps

    while 2.3.99-pre3 idebus=66 multcount=8 only gets to

    0.02user 2.34system 0:08.91elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
    0inputs+0outputs (105major+13minor)pagefaults 0swaps

    It seems we're far slower than we used to be... this is a Quantum
    Fireball SE4.3A, QDI Titanium IB board, TX430 chipset @66Mhz,
    AMD K6-200 with 64MB 10ns SDRAM.

    Thanks for any input,

    --alessandro <> <>

    Linux 2.2.14/2.3.99-pre3 glibc-2.1.2-11 gcc-2.95.2 binutils-

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