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    SubjectRe: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)
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    Andi Kleen <ak@suse.de> writes:

    > On Wed, Feb 12, 2003 at 10:27:41AM +0000, Jamie Lokier wrote:
    > > Andi Kleen wrote:
    > > > + /* FIXME should disable preemption here but how can we reenable it? */
    > > > +
    > > > + enable_sysenter();
    > > > +
    > >
    > > Try this:
    >
    > [...] I have no real interest in vm86 mode, perhaps one of the people
    > interested in dosemu etc. could take care of it. I'm very glad it doesn't
    > exist on my main architecture - x86-64 - given how many hacks it needs to be
    > supported.

    There is certainly some old cruft in there, but...

    I have been thinking evil thoughts lately about what it would take
    to implement on x86-64.

    Switching in and out of long mode is evil enough that I don't think it
    is worth it. And encouraging people to write good JIT compiling
    emulators sounds much better, especially in the long run. But it can
    be written.

    Eric
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