From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932535AbeEWKxJ (ORCPT ); Wed, 23 May 2018 06:53:09 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:37782 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932391AbeEWKxE (ORCPT ); Wed, 23 May 2018 06:53:04 -0400 Date: Wed, 23 May 2018 12:53:02 +0200 From: Pavel Machek To: Christian =?iso-8859-1?Q?Kr=FCger?= Cc: linux-kernel@vger.kernel.org Subject: Re: Suggestion: =?utf-8?B?4oCec3BlY3RyZV92?= =?utf-8?B?Mj1vZmbigJwgYW5kIOKAnm5vcHRp?= =?utf-8?B?4oCc?= per default in "Intel Atom N270" case? Message-ID: <20180523105302.GE15312@amd> References: <72a7122d-0020-f307-a76d-bb80a2c19842@web.de> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="M/SuVGWktc5uNpra" Content-Disposition: inline In-Reply-To: <72a7122d-0020-f307-a76d-bb80a2c19842@web.de> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --M/SuVGWktc5uNpra Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat 2018-05-19 21:53:02, Christian Kr=FCger wrote: > Hi, >=20 > 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? >=20 > Browsing the web, I can "feel the difference" if the matching kernel opti= ons > 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 --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --M/SuVGWktc5uNpra Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlsFSA4ACgkQMOfwapXb+vJCPACgjUfIt4MrQuWRA1SL/d72GEby YGsAnjDf0q57pK4WO8YDjYiikKjcyxXf =Ivix -----END PGP SIGNATURE----- --M/SuVGWktc5uNpra--