Re: Re: [Bug 350] New: i386 context switch very slow compared to 2.4 due to wrmsr (performance)

From: Linus Torvalds (
Date: Wed Feb 12 2003 - 13:57:40 EST wrote:
> BTW, why is sysenter supposed to be disabled while in vm86?

The only reason is to make vm86-mode more "compatible". In other words,
trap the GP that happens if SYSENTER_CS is 0, and make sure vm86 mode
works the way it historically did.

We can choose to say "screw it", I guess, and just see if it actually
breaks anything.


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