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

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Message-ID: <4A2E7B40.4070608@zytor.com>
Date:	Tue, 09 Jun 2009 08:09:52 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Nick Piggin <npiggin@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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

Ingo Molnar wrote:
> 
> OTOH, highmem is clearly a useful hardware enablement feature with a 
> slowly receding upside and a constant downside. The outcome is 
> clear: when a critical threshold is reached distros will stop 
> enabling it. (or more likely, there will be pure 64-bit x86 distros)
> 

A major problem is that distros don't seem to be willing to push 64-bit
kernels for 32-bit distros.  There are a number of good (and
not-so-good) reasons why users may want to run a 32-bit userspace, but
not running a 64-bit kernel on capable hardware is just problematic.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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