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    SubjectRe: kernel 2.4.21 , large disk write => system crawls
    > >>when i do a large disk write operation ( copy a big file for example ), 
    > >>the whole system becomes very busy ( system goes into 99% cpu

    it's not write-specific. you can see below that you're somehow
    managing to trigger roughly two interrupts per *either* bi or bo.
    for a normal IDE setup, you should see one interrupt per 16-64K
    under average use. it's almost like your sys somehow thinks
    that it can only transfer 1 sector per interrupt!

    > everytime i experience a slowdown, there's a 'big' number in the io (bo)
    > column.

    no, it's basically in=2*(bi+bo), as if your system somehow believes
    it can only do a single sector per interrupt (PIO and -m1 perhaps?)
    it should be more like 32K per interrupt.

    > Jun 27 22:52:31 charlus kernel: Found and enabled local APIC!

    have you tried without that?

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