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

[H. Peter Anvin]

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.

	-hpa

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