linux-kernel - Re: Suggestion: „spectre_v2=off“ and „nopti“ per default in "Intel Atom N270" case?

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Message-ID: <20180523105302.GE15312@amd>
Date:   Wed, 23 May 2018 12:53:02 +0200
From:   Pavel Machek <pavel@....cz>
To:     Christian Krüger <C.Krueger.B@....de>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Suggestion: „spectre_v2=off“ and „nopti“ per default in
 "Intel Atom N270" case?

On Sat 2018-05-19 21:53:02, Christian Krüger wrote:
> Hi,
> 
> Since the old "in-order-execution" Intel CPUs like the Intel Atom N270
> (known for being installed in many Netbooks and Nettops) are not sensitive
> for "Meltdown" & "Spectre" , wouldn't it be a good idea to exclude these
> anyway "weak" CPUs from the costly patches by default?
> 
> Browsing the web, I can "feel the difference" if the matching kernel options
> are applied on such a device.

Can you also measure the difference? Placebo effect is hard to avoid.

But yes, we do not need to do workarounds on non-buggy machines...

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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