Hi, I'm running Lubuntu on a non-PAE kernel too :) 1.4GHz Pentium M in a Dell Latitude D505 with 512MB RAM from 2004. It's my main production machine and runs Lubuntu like a charm.
I've been reading through the emails and irc logs, and it sounds like the kernel team is maintaining the non-pae kernel in Precise (but not beyond), but just not setting it as the default -- any chance someone can convince them to make the non-pae kernel the default in just Lubuntu? Colin Watson mentioned this as a possibility in the Technical Board meeting [1]. -Steven [1]: http://ubottu.com/meetingology/logs/ubuntu-meeting/2011/ubuntu-meeting.2011-12-12-21.01.moin.txt On Sun, Nov 20, 2011 at 5:31 PM, Yorvyk <yorvik.ubu...@googlemail.com>wrote: > On Sun, 20 Nov 2011 13:20:35 -0800 > Jonathan Marsden <jmars...@fastmail.fm> wrote: > > > On 11/20/2011 07:29 AM, Chow Loong Jin wrote: > > > > > On 20/11/2011 19:31, Yorvyk wrote: > > > > > > >> If a CPU can't support PAE it can't support more than 4GiB of RAM, > > >> so the PAE part of the kernel shoudn't come into play. > > > > > > > > > From what I understand, PAE has a different set of paging structures > > > compared to non-PAE. Does the kernel know to fall back onto non-PAE > > > mode if it cannot enable PAE on a CPU? > > > > > > Which way to do things is basically a compile time option for the > > kernel, as I understand it. So, if a PAE kernel is used, it can *only* > > be run on processors that support the additional PAE instructions. Even > > if a machine only has 128MB RAM, it you try to run a PAE kernel on it, > > and the CPU lacks the PAE instruction, it is not going to run. > > > > The real question is: are there really any CPUs in general purpose > > desktops or laptops, in any significant quantity at all, that Ubuntu > > 11.10 i386 kernels work on, which PAE kernels do not work on? > > > > Other than the early 400MHz Pentium-M, which are pretty rare, I don't > > think anyone has seen such a CPU yet. Via C3 and AMD Geode LX already > > cannot run current Ubuntu 11.10 default kernels anyway. > > > Having trawled the net for info on this, I have no problem with dropping > the non-PAE kernel as it appears to only effect a very,very, very small > number of users. Whether these are current or potential users is going to > be very hard to find out, unless they start jumping up-and-down screaming. > My one concern was the alleged overhead of the PAE kernel but, this > appears, from the various benchmarks I've seen, to be trivial and probably > unnoticeable in normal use. I have installed PAE kernels on a couple of > machines, one oneiric and one precise, and have not noticed any problems so > far. > I would imagine by the time 12.04 is no longer supported, 32 bit ubuntus > may well be limited to the ARM anyway. > > > > > -- > Yorvyk > > _______________________________________________ > Mailing list: https://launchpad.net/~lubuntu-desktop > Post to : lubuntu-desktop@lists.launchpad.net > Unsubscribe : https://launchpad.net/~lubuntu-desktop > More help : https://help.launchpad.net/ListHelp >
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