Ubuntu
linux package

Ubuntu 12.10 32-bit only shows a maximum of 8 cores

Bug #1164122 reported by Rennie Gardner
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Won't Fix
Medium
Unassigned

Bug Description

Hi,

I have a 6 core, 12 hyperthreaded Intel processor. With 32-bit Ubuntu 12.10, only 8 "cores" show up instead of 12. I believe the 32-bit version has the kernel compiled for a MAX of 8 cores, but I don't think this makes sense. I know the 64-bit version will handle this properly and show all 12 "cores", but for my application development purposes I need to use the 32-bit version of Ubuntu. Can this be fixed in a patch to Ubuntu 12.10?

Thanks,
Rennie

Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1164122/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

tags: added: bot-comment
Revision history for this message
Joe Burgess (joemburgess) wrote :

This is a default decision made by the Ubuntu team. I can't seem to find anything that justifies this decision but to get around it you'll need to change a configuration file and then recompile your kernel. This isn't as hard as it seems and there are resources online to help you out.

To recompile, follow the directions in this article https://help.ubuntu.com/community/Kernel/Compile
Make sure you change the configuration line listed in this article before compiling though http://askubuntu.com/questions/165507/how-to-change-maximum-number-of-cores

Hope that helps.

affects: ubuntu → linux (Ubuntu)
Revision history for this message
Brad Figg (brad-figg) wrote : Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1164122

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status: New → Incomplete
tags: added: quantal
Joseph Salisbury (jsalisbury)
Changed in linux (Ubuntu):
importance: Undecided → Medium
Revision history for this message
Joseph Salisbury (jsalisbury) wrote :

You can expierement with increasing with a higher value for CONFIG_NR_CPUS. In the past, there were issues and memory limitations with setting this to higher than 8.

Changed in linux (Ubuntu):
status: Incomplete → Won't Fix
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