Public bug reported: Opening a new report as advised by Andrew Hunter in #281276.
The linux-rt 2.6.27-3.8 release only uses one CPU (or core). Perhaps of note is that the rt variant does not set CONFIG_NR_CPUS which is set to 64 in 2.6.27-7-generic and is set to 8 in the old 2.6.24-21-rt. It also does not set CONFIG_SMP which is set to y on the other two. After booting 2.6.27-3-rt dmesg contains this line: [ 0.000000] WARNING: NR_CPUS limit of 1 reached. Processor ignored. Compared to booting the non-rt 2.6.27-7-generic: [ 0.000000] SMP: Allowing 2 CPUs, 0 hotplug CPUs [ 0.000000] PERCPU: Allocating 64928 bytes of per cpu data [ 0.000000] NR_CPUS: 64, nr_cpu_ids: 2, nr_node_ids 1 ** Affects: linux-rt (Ubuntu) Importance: Undecided Status: New -- linux-rt restricted to one CPU https://bugs.launchpad.net/bugs/290498 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs