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Camaleón 06-21-2011 02:59 PM

Question about the new kernel with PAE (Wheezy)
 
Hello,

On my testing VM machine, I'm currently running:

root@debian:~# uname -a
Linux debian 2.6.38-2-686 #1 SMP Sun May 8 14:49:45 UTC 2011 i686 GNU/Linux

Today, I've just run a dist-upgrade and see this:

The following NEW packages will be installed:
linux-image-2.6.39-2-686-pae (2.6.39-2)
linux-image-686-pae (2.6.39+35.1)
mksh (40.1-1)
The following packages will be upgraded:
cvs (1.12.13-12+b2 => 1.12.13+real-5)
git (1.7.5.3-1 => 1.7.5.4-1)
git-man (1.7.5.3-1 => 1.7.5.4-1)
linux-image-686 (2.6.38+34 => 2.6.39+35.1)
linux-libc-dev (2.6.38-5 => 2.6.39-2)
5 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 39.2 MB of archives.
After this operation, 85.3 MB of additional disk space will be used.

But my VM does not expose the PAE/NX feature:

root@debian:~# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2400 @ 1.83GHz
stepping : 8
cpu MHz : 1828.410
cache size : 6144 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov clflush mmx fxsr sse sse2 constant_tsc up pni monitor
bogomips : 3656.82
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 32 bits virtual
power management:

I already knew about this kernel change:

http://lists.debian.org/debian-kernel/2011/02/msg00244.html

But now the day has come and I've got two questions:

1. Will the PAE kernel work on this VM? I guess no.

2. Shouldn't the dist-upgrade routine had to automatically determine the
best kernel for this system? Or at least provide some kind of warning? I
think a 486 kernel would be a more sensitive choice.

Any commnents?

Greetings,

--
Camaleón


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Gilbert Sullivan 06-21-2011 04:16 PM

Question about the new kernel with PAE (Wheezy)
 
On 06/21/2011 10:59 AM, Camaleón wrote:

But now the day has come and I've got two questions:

1. Will the PAE kernel work on this VM? I guess no.

2. Shouldn't the dist-upgrade routine had to automatically determine the
best kernel for this system? Or at least provide some kind of warning? I
think a 486 kernel would be a more sensitive choice.

Any commnents?


Hi, Camaleón!

My spare sub-notebook (Panasonic CF-R3) shows

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.10GHz
stepping : 6
cpu MHz : 1100.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov clflush
dts acpi mmx fxsr sse sse2 ss tm pbe bts est tm2

bogomips : 2194.59
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 32 bits virtual
power management:

Since this is my spare notebook, and I can mess it up if I want to, I
decided to go ahead and give the kernel upgrade a shot. As expected, I
got a message from aptitude about the kernel not being supported by the
processor on this system. The message suggested installing the 486
kernel and removing the newly obsoleted 686 kernel.


For the heck of it, I went ahead and installed it anyway, but the new
kernel was listed as not configured. I decided to be a good boy, install
the 486 kernel, and remove the new (unconfigured PAE version) and old
686 kernels. All is well.


Aptitude was nice to me. And that's what happens if you try to install
the inappropriate kernel on a physical machine. I imagine it'll work the
same way on a VM, but my imagination is sometimes not very bright!


;-)

Best regards,
Gilbert


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