From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.6) Gecko/20040211 Firefox/0.8 Description of problem: My P4 hyperthreading capable box correctly identifies two processors, however no threads ever run on CPU1. Version-Release number of selected component (if applicable): kernel-2.4.22-1.2115.nptlsmp How reproducible: Always Steps to Reproduce: Install Fedora Core1 on a P4 Hyperthreading capable system, and run something that is multi threaded, eg make -j2 xxxx Actual Results: CPU0 gets a healthy workload, however CPU1 gets no threads executing on it. Expected Results: there should be some processes running on CPU1 Additional info: Bad example - but if you watch top wharlst doing a make -j2 you will see something like: CPU states: cpu user nice system irq softirq iowait idle total 90.6% 0.0% 8.2% 0.0% 0.0% 0.0% 100.8% cpu00 90.6% 0.0% 8.3% 0.0% 0.0% 0.0% 0.9% cpu01 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 100.0%
Created attachment 98537 [details] /proc/cpuinfo output
Created attachment 98538 [details] dmesg output
upgrade to the latest errata kernel (2174) and see if its repeatable there.
I have the same issue on a Xeon 2.8ghz. Cpu01 is 100% idle at all times. This happens on all of the following kernels: kernel-smp-2.4.22-1.2149.nptl kernel-smp-2.4.22-1.2166.nptl kernel-smp-2.4.22-1.2115.nptl kernel-smp-2.4.22-1.2174.nptl
Created attachment 98704 [details] top, desg & cpuinfo output
Looks similar to https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=112597
does this still happen with recent kernels?
Thanks for the bug report. However, Red Hat no longer maintains this version of the product. Please upgrade to the latest version and open a new bug if the problem persists. The Fedora Legacy project (http://fedoralegacy.org/) maintains some older releases, and if you believe this bug is interesting to them, please report the problem in the bug tracker at: http://bugzilla.fedora.us/