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    SubjectRe: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops
    On 07-12-07 18:19, Alan Cox wrote:

    > On Fri, 7 Dec 2007 17:31:16 +0100
    > Andi Kleen <andi@firstfloor.org> wrote:
    >
    >>> You don't need to. Port 0x80 historically is about 8uS so just udelay(8)
    >>> and make sure the initial default delay is conservative enough before the
    >> How would you make it conservative enough handling let's say a 6Ghz CPU
    >> that can execute multiple jumps per cycle?
    >
    > Pick a sane worst case and go with it at boot. We don't have to be
    > accurate before we tune udelay - over long in uSecs isnt going to hurt,
    > and most post boot _p's can be replaced by udelay(8) now

    Isn't 8 generally a bit overly long? I believe the norm is 1?

    Rene.


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