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    SubjectRe: NS83820 2.6.0-test5 driver seems unstable on IA64
    >>>>> "David" == David S Miller <davem@redhat.com> writes:

    David> On Mon, 22 Sep 2003 20:36:29 -0400 Benjamin LaHaise
    David> <bcrl@kvack.org> wrote:

    >> Denied. Dave, please explain.

    David> Why should I have anything to explain? :-)

    David> The fact that ia64 is doing a printk for an unaligned kernel
    David> load or store is what you should be asking questions about :)

    How expensive is it to take the trap and do a fix up, compared to
    making an aligned copy? As it involves raising and handling a fault
    disassembling the instruction that caused the fault, etc., I'd be
    surprised if it's much less than 1000 cycles, even without the printk,
    although I haven't measured it yet, and can't find enough info in the
    architecture manuals to know what it is.

    Even if it's only 500 cycles, you can copy and realign a large packet
    in that time.

    --
    Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au
    You are lost in a maze of BitKeeper repositories, all slightly different.
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