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
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linux-rt restricted to one CPU
https://bugs.launchpad.net/bugs/290498
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