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

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Date:	Tue, 9 Jun 2009 11:07:41 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	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



On Tue, 9 Jun 2009, Linus Torvalds wrote:
>
> And they'd be even less common if the whole "64-bit kernel even if you do 
> a 32-bit distro" was more common.

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.

			Linus
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