linux-kernel - Re: [benchmark] 1% performance overhead of paravirt

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Message-ID: <4A2EE80D.2010708@zytor.com>
Date:	Tue, 09 Jun 2009 15:54:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <mjg@...hat.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Nick Piggin <npiggin@...e.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [benchmark] 1% performance overhead of paravirt_ops on native
 kernels

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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