CPU issue on "Space Oddity" [SOLVED]

Forum rules
We don't support installations in VirtualBox, VMWare, qemu or others. We ignore posts about WINE, PlayOnLinux, Steam and Skype. We don't support btrfs, lvm, UEFI, side-by-side installations with GPT or dualboot with anything newer than Windows XP.
Google your problem first. Check the Wiki. Read the existing threads. It's okay to "hijack" an existing thread, yes! If your problem is not yet covered, open a new thread. To get the quickest possible help, mention the exact release codename in your post (uname -a is a good idea, too). Due to the lack of crystal balls, attach the output of lspci -nnk if you encounter hardware problems.
User avatar
elixir
Weight Watcher
Posts: 357
Joined: Fri Feb 21, 2014 8:25 am

CPU issue on "Space Oddity" [SOLVED]

Unread post by elixir » Sat Feb 06, 2016 4:48 pm

Hello grillers,

This seems to be an issue with the Debian Jessie kernel itself, but I thought I would inform you just in case this has happened to anyone else.

The default Jessie kernel (and upgraded kernel) only recognizes one core on my dual core CPU (Intel Core 2 Duo). I had an extra siduction kernel lying around which fixed the issue and recognized my two cores. Do any of you know of this issue? Is the only resolution dropping the Jessie kernel and supplying my own like I have done?

lscpu below:

Code: Select all

Architecture:          i686
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                1
On-line CPU(s) list:   0
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 23
Model name:            Intel(R) Core(TM)2 Duo CPU     T9550  @ 2.66GHz
Stepping:              10
CPU MHz:               800.000
CPU max MHz:           2668.0000
CPU min MHz:           800.0000
BogoMIPS:              5320.21
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              6144K
Last edited by elixir on Sat Feb 06, 2016 5:45 pm, edited 1 time in total.
Out of the corner of your eye you spot him... Shia LaBeouf.

https://www.youtube.com/watch?v=o0u4M6vppCI

pidsley
Hermit
Posts: 2539
Joined: Wed Oct 17, 2012 12:31 pm

Re: CPU issue on "Space Oddity"

Unread post by pidsley » Sat Feb 06, 2016 4:55 pm

What kernel are you using? If you are still using the 586 kernel, it will only recognize one core. You need the 686 kernel to use both cores.

What is the output of "uname -a"?

User avatar
elixir
Weight Watcher
Posts: 357
Joined: Fri Feb 21, 2014 8:25 am

Re: CPU issue on "Space Oddity"

Unread post by elixir » Sat Feb 06, 2016 5:44 pm

I was indeed using the stock 585 kernel. I was completely unaware that you needed 686 kernel to use both kernels. You learn something new everyday. Thanks, pidsley!
Out of the corner of your eye you spot him... Shia LaBeouf.

https://www.youtube.com/watch?v=o0u4M6vppCI

pidsley
Hermit
Posts: 2539
Joined: Wed Oct 17, 2012 12:31 pm

Re: CPU issue on "Space Oddity" [SOLVED]

Unread post by pidsley » Sat Feb 06, 2016 5:56 pm

You're welcome. The Debian 486 kernels only recognize one core as well. It is possible to build a multi-core enabled 486 or 586 kernel, but Debian doesn't do this (antix does.) I believe bacon uses the 586 kernels because they use slightly less memory and will boot on a non-PAE processor (Debian doesn't provide a 686 non-PAE kernel.) People who want the 686-PAE kernel can easily upgrade after installation.

tl:dr; it's a feature, not a bug. (-:

User avatar
simgin
Meme Fodder
Posts: 1167
Joined: Sun Jan 06, 2013 12:07 am
Location: Bradford-on-Avon, UK

Re: CPU issue on "Space Oddity" [SOLVED]

Unread post by simgin » Sat Feb 06, 2016 7:00 pm

Aha, I never knew that about the 586, and I don't know why, but i always thought that anything above 486 could handle multi-cores. Thank you Pidsley, I wish I had you as a tech teacher years back when I was in school :)
Heh and thank you for bringing it up Elixir :D

cheerio
simon
Someone told me that I am delusional, I almost fell off my unicorn.

machinebacon
Baconator
Posts: 10253
Joined: Thu Sep 16, 2010 11:03 am
Location: Pfälzerwald
Contact:

Re: CPU issue on "Space Oddity" [SOLVED]

Unread post by machinebacon » Sun Feb 07, 2016 1:30 am

The 486 in Debian is actually a 586 kernel (or vice versa), the stock BBQ kernel is usually this 586 one to make sure it boots on every (old) machine. After installation, run pisley's get-kernel script and pick a nicer kernel, like liquorix or siduction.
..gnutella..

Post Reply