Bug 182640 - SMP enabled in Uniprocessor kernel
Summary: SMP enabled in Uniprocessor kernel
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 4
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Brian Brock
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-02-23 19:55 UTC by Mostafa Afgani
Modified: 2007-11-30 22:11 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2006-02-23 20:05:37 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Mostafa Afgani 2006-02-23 19:55:56 UTC
Description of problem:
SMP is enabled in Uniprocessor kernel -- leading to problems with drivers that
don't work with SMP.

Version-Release number of selected component (if applicable):
2.6.15-1.1831_FC4

How reproducible:
Always

Steps to Reproduce:
1. Install kernel-2.6.15-1.1831_FC4
2. 
3.
  
Actual results:
SMP is enabled (as seen in kernel .config)

Expected results:
SMP disabled for uniprocessor kernel

Additional info:

Comment 1 Ignacio Vazquez-Abrams 2006-02-23 20:05:37 UTC
This has been discussed before. The performance loss from running SMP on a UP
x86_64 machine is negligable.

Comment 2 Mostafa Afgani 2006-02-23 20:20:12 UTC
(In reply to comment #1)
> This has been discussed before. The performance loss from running SMP on a UP
> x86_64 machine is negligable.

Yes, but it's causing havoc with my WiFi driver (RaLink) -- resulting in a
system that won't boot. Why enable it if it's not going to be used anyway? I'm
sure I'm not the only one who wants to use a Uniprocessor kernel just to get a a
piece of hardware going that won't work with SMP enabled kernels..


Comment 3 Dave Jones 2006-02-23 22:20:53 UTC
actually, this was a regression in FC4 that is being reverted in the next update 
(should be ready next week).

Ignacio's comment only applies to rawhide/FC5 onwards.



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