Re: [benchmark] 1% performance overhead of paravirt_ops on nativekernels

From: H. Peter Anvin
Date: Tue Jun 09 2009 - 19:02:22 EST

Matthew Garrett wrote:
> On Tue, Jun 09, 2009 at 11:07:41AM -0700, Linus Torvalds wrote:
>> Side note: intel is to blame too. I think several Atom versions were
>> shipped with 64-bit mode disabled. So even "modern" CPU's are sometimes
>> artifically crippled to just 32-bit mode.
> And some people still want to run dosemu so they can drive their
> godforsaken 80s era PIO driven data analyzer. It'd be nice to think that
> nobody used vm86, but they always seem to pop out of the woodwork
> whenever someone suggests 64-bit kernels by default.

There is both KVM and Qemu as alternatives, though. The godforsaken
80s-era PIO driven data analyzer will run fine in Qemu even on
non-HVM-capable hardware if it's 64-bit capable. Most of the time it'll
spend sitting in PIO no matter what you do.


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