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    SubjectRe: Differences between FreeBSD and Linux system call mechanism
    > Terry Lambert wrote:
    > Linux uses a call-gate based kernel entry, which is TSS based, and

    It is not TSS baset, it is _trap_ based and uses int 0x80. Look
    at .../linux/arch/i386/kernel/traps.c and entry.S

    > therefore takes more CPU cycles on a contect switch than strictly
    > required. The FreeBSD mechanism for kernel entry (and subsequet
    > context switch) is threfore more efficient than that used by Linux.

    I don't know what is the BSD mechanism, but in Linux tasks are software
    switched since 2.1.1xx something. Read the note before __switch_to() in
    .../linux/arch/i386/kernel/process.c. I prefer _safe_ instead of _fast_
    task switching.


    Petko Manolov,

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