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Date: Tue, 9 Jun 2009 23:48:58 +0100
From: Matthew Garrett <mjg@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
       Nick Piggin <npiggin@suse.de>, Rusty Russell <rusty@rustcorp.com.au>,
       Jeremy Fitzhardinge <jeremy@goop.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>, Avi Kivity <avi@redhat.com>,
       Arjan van de Ven <arjan@infradead.org>
Subject: Re: [benchmark] 1% performance overhead of paravirt_ops on native
	kernels
Message-ID: <20090609224858.GA18252@srcf.ucam.org>
References: <4A0B62F7.5030802@goop.org> <200906032208.28061.rusty@rustcorp.com.au> <alpine.LFD.2.01.0906030901460.4880@localhost.localdomain> <200906041554.37102.rusty@rustcorp.com.au> <alpine.LFD.2.01.0906040736350.4880@localhost.localdomain> <20090609093918.GC16940@wotan.suse.de> <20090609111719.GA4463@elte.hu> <4A2E7B40.4070608@zytor.com> <alpine.LFD.2.01.0906091103080.6847@localhost.localdomain> <alpine.LFD.2.01.0906091106470.6847@localhost.localdomain>
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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.

-- 
Matthew Garrett | mjg59@srcf.ucam.org
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