From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f72.google.com (mail-pl0-f72.google.com [209.85.160.72]) by kanga.kvack.org (Postfix) with ESMTP id 679DE6B0003 for ; Sun, 11 Feb 2018 18:23:01 -0500 (EST) Received: by mail-pl0-f72.google.com with SMTP id f64so3050754plb.7 for ; Sun, 11 Feb 2018 15:23:01 -0800 (PST) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id 2sor490648pgh.370.2018.02.11.15.22.59 for (Google Transport Security); Sun, 11 Feb 2018 15:23:00 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Andy Lutomirski Mime-Version: 1.0 (1.0) Subject: Re: [PATCH 00/31 v2] PTI support for x86_32 Date: Sun, 11 Feb 2018 14:30:15 -0800 Message-Id: References: <1518168340-9392-1-git-send-email-joro@8bytes.org> <20180209191112.55zyjf4njum75brd@suse.de> <20180210091543.ynypx4y3koz44g7y@angband.pl> <20180211105909.53bv5q363u7jgrsc@angband.pl> <6FB16384-7597-474E-91A1-1AF09201CEAC@gmail.com> <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> <1518387160.3979.10.camel@HansenPartnership.com> In-Reply-To: <1518387160.3979.10.camel@HansenPartnership.com> Sender: owner-linux-mm@kvack.org List-ID: To: James Bottomley Cc: Mark D Rustad , Adam Borowski , Linus Torvalds , Joerg Roedel , Andy Lutomirski , Joerg Roedel , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , X86 ML , LKML , Linux-MM , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , "Liguori, Anthony" , Daniel Gruss , Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek > On Feb 11, 2018, at 2:12 PM, James Bottomley wrote: >=20 >> On Sun, 2018-02-11 at 11:42 -0800, Andy Lutomirski wrote: >>=20 >>> On Feb 11, 2018, at 9:40 AM, Mark D Rustad wrote: >>>=20 >>>=20 >>>>=20 >>>> On Feb 11, 2018, at 2:59 AM, Adam Borowski >>>> wrote: >>>>=20 >>>>>=20 >>>>> Does Debian make it easy to upgrade to a 64-bit kernel if you >>>>> have a >>>>> 32-bit install? >>>>=20 >>>> Quite easy, yeah. Crossgrading userspace is not for the faint of >>>> the heart, >>>> but changing just the kernel is fine. >>>=20 >>> ISTR that iscsi doesn't work when running a 64-bit kernel with a >>> 32-bit userspace. I remember someone offered kernel patches to fix >>> it, but I think they were rejected. I haven't messed with that >>> stuff in many years, so perhaps the userspace side now has >>> accommodation for it. It might be something to check on. >>>=20 >>=20 >> At the risk of suggesting heresy, should we consider removing x86_32 >> support at some point? >=20 > Hey, my cloud server is 32 bit: >=20 > bedivere:~# cat /proc/cpuinfo=20 > processor : 0 > vendor_id : GenuineIntel > cpu family : 15 > model : 2 > model name : Intel(R) Pentium(R) 4 CPU 2.80GHz > stepping : 9 > microcode : 0x2e > cpu MHz : 2813.464 > [...] >=20 > I suspect a lot of people are in the same position: grandfathered in on > an old hosting plan, but not really willing to switch to a new 64 bit > box because the monthly cost about doubles and nothing it does is > currently anywhere up to (let alone over) the capacity of the single > 686 processor. >=20 > The thing which is making me consider it is actually getting a TPM to > protect the private keys, but doubling the monthly cost is still a huge > disincentive. Where are they hosting this? Last I checked, replacing a P4 and motherboard= with something new paid for itself in about a year in power savings. >=20 > James >=20 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org