From: Pavel Machek <pavel@ucw.cz>
To: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Joerg Roedel <jroedel@suse.de>, Meelis Roos <mroos@linux.ee>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Not-so-old machines without PAE was Re: 32-bit PTI with THP = userspace corruption
Date: Tue, 23 Oct 2018 11:11:27 +0200 [thread overview]
Message-ID: <20181023091127.GA9843@amd> (raw)
In-Reply-To: <20181022194817.148796e6@alans-desktop>
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On Mon 2018-10-22 19:48:17, Alan Cox wrote:
> On Mon, 22 Oct 2018 09:56:42 +0200
> Joerg Roedel <jroedel@suse.de> wrote:
>
> > On Sun, Oct 21, 2018 at 02:37:45PM +0200, Pavel Machek wrote:
> > > On Tue 2018-09-18 14:00:30, Alan Cox wrote:
> > > > There are pretty much no machines that don't support PAE and are still
> > > > even vaguely able to boot a modern Linux kernel. The oddity is the
> > > > Pentium-M but most distros shipped a hack to use PAE on the Pentium M
> > > > anyway as it seems to work fine.
> > >
> > > I do have some AMD Geode here, in form of subnotebook. Definitely
> > > newer then Pentium Ms, but no PAE...
> >
> > Are the AMD Geode chips affected by Meltdown?
>
> Geode for AMD was just a marketing name.
>
> The AMD athlon labelled as 'Geode' will behave like any other Athlon but
> I've not seen anyone successfully implement Meltdown on the Athlon so it's
> probably ok.
>
> The earlier NatSemi ones are not AFAIK vulnerable to either. The later
> ones might do Spectre (they have branch prediction which is disabled on
> the earlier ones) but quite possibly not enough to be attacked usefully -
> and you can turn it off anyway if you care.
>
> And I doubt your subnotebook can usefully run modern Linux since the
> memory limit on most Geode was about 64MB.
Well, let me see. The machine is not too useful because of dead
battery, but I don't believe RAM would be a problem. It has 512MB or
more, IIRC. Missing PAE is, and missing instructions are. And horrible
keyboard and bad driver support from Linux. And... Ouch and fact that
I use its power supply to power something else.
It looks similar to this:
https://hexus.net/tech/news/laptop/13994-kohjinsha-launches-impressive-subnotebook-twist/
(but has no touchscreen).
Bios is "built 03/02/2007".
CPU is "AuthenticAMD" family 5 model 10, "Geode(TM) Integrated Processor
by AMD PCS". 500 MHz, flags "fpu de pse tsc msr cx8 sep pge cmov
clflush mmx mmxext 3dnowext 3dnow". 512MB RAM.
This is not a suitable compile server, but still could work as a
subnotebook given right software...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2018-10-23 9:11 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-30 18:09 32-bit PTI with THP = userspace corruption Meelis Roos
2018-08-30 20:55 ` Joerg Roedel
2018-08-31 4:12 ` Meelis Roos
2018-08-31 7:07 ` Joerg Roedel
2018-09-08 10:24 ` Thomas Gleixner
2018-09-11 11:49 ` Joerg Roedel
2018-09-11 11:58 ` Meelis Roos
2018-09-11 12:12 ` Joerg Roedel
2018-09-18 13:00 ` Alan Cox
2018-10-21 12:37 ` Pavel Machek
2018-10-22 7:56 ` Joerg Roedel
2018-10-22 18:48 ` Alan Cox
2018-10-23 9:11 ` Pavel Machek [this message]
2018-10-22 20:56 ` Pavel Machek
2018-09-11 18:20 ` Linus Torvalds
2018-08-31 7:10 ` Meelis Roos
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