[Bug 37294] Multithreaded code does not utilize processors on a Centrino Duo

[Alex]

Public bug reported:
https://launchpad.net/malone/bugs/37294

Affects: linux-source-2.6.15 kernel-image-2.6.15-19-386-di (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I have a simple program that uses two threads (it actually measures the
behaviour of multithreading). The point is, the threads never seem to
utilize the two processors.

General multiprocessing (running several programs and seeing them occupy
different processor cores) works OK.

I'm running the latest Dapper with a stock SMP kernel on a Dell Inspiron
9400 - which has a dual-core Centrino Duo processor. I'll post the
benchmark in an attachment to this report.