On 11/02/2016 05:30 PM, Ed Greshko wrote:
On 11/03/16 07:10, jd1008 wrote:
>
>
> On 11/02/2016 11:59 AM, Rick Stevens wrote:
>> On 11/02/2016 10:41 AM, jd1008 wrote:
>>> Fedora-Workstation-Live-x86_64-24-1.2.iso
>>>
<
http://mirrors.kernel.org/fedora/releases/24/Workstation/x86_64/iso/Fedor...
>>>
>>> 14-Jun-2016 17:13 1G
>>> Fedora-Workstation-Live-i386-24-1.2.iso
>>>
<
http://mirrors.kernel.org/fedora/releases/24/Workstation/i386/iso/Fedora-...
>>>
>>> 14-Jun-2016 17:27 2G
>>>
>>> Why?
>> Have you looked at the file lists? I haven't (I don't have any 32-bit
>> machines), but a first guess may be that the 32-bit version has both
>> PAE and non-PAE kernels, libraries, etc., so you have more "stuff" to
>> support the hardware environment adequately.
>
> On the face of it, it sounds logical, but it makes no sense.
> I can understand that 64bit systems are supposed to support 32bit apps,
> but I have never come across a 32bit system that supports 64bit apps.
> Apps do not depend on low level PAE OS architecture.
It makes perfect sense.
The PAE kernel allows for access of up to 64GB of RAM from a max of 4GB on 32 bit
systems
whose CPU's offer the PAE extension. Nothing to do with support of 32-bit v.s.
64-bit apps.
If you mount the WS-32bit iso and then mount the squashfs under LiveOS and then mount
the
rootfs.img under LiveOS of the mounted squashfs you'd see....
[egreshko@meimei iso2]$ ls
bin dev home lost+found mnt proc run srv tmp var
boot etc lib media opt root sbin sys usr
[egreshko@meimei iso2]$ ls boot
config-4.5.5-300.fc24.i686 initramfs-4.5.5-300.fc24.i686+PAE.img
config-4.5.5-300.fc24.i686+PAE initrd-plymouth.img
efi memtest86+-5.01
elf-memtest86+-5.01 System.map-4.5.5-300.fc24.i686
extlinux System.map-4.5.5-300.fc24.i686+PAE
grub2 vmlinuz-4.5.5-300.fc24.i686
initramfs-4.5.5-300.fc24.i686.img vmlinuz-4.5.5-300.fc24.i686+PAE
While with the WS-64bit iso you'd see
[egreshko@meimei iso2]$ ls
bin dev home lib64 media opt root sbin sys usr
boot etc lib lost+found mnt proc run srv tmp var
[egreshko@meimei iso2]$ ls boot
config-4.5.5-300.fc24.x86_64 initramfs-4.5.5-300.fc24.x86_64.img
efi initrd-plymouth.img
elf-memtest86+-5.01 memtest86+-5.01
extlinux System.map-4.5.5-300.fc24.x86_64
grub2 vmlinuz-4.5.5-300.fc24.x86_64
Thanks for elucidating that for me, Ed. I believe there's also
differences in the library trees, too, for PAE and non-PAE.
JD, what Ed's saying is that 32-bit CPUs that do NOT have the PAE
extensions can only access 4GB of RAM. The PAE extensions present on
some CPUs permit access to 64GB of RAM. There are kernel differences
between the two and I think (although I'm not certain) that there may
be two different sets of libraries as well (or at least code in them
to handle the differences). That can easily explain the size
differences.
The only alternative would be for Fedora to offer two different sets of
32-bit disks, non-PAE and PAE-enabled. There's enough confusion with
the disk sets as it stands now. I can sure see why they don't do it.
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