On Thu, Jan 28, 2010 at 12:16:44PM +1300, zhiyi wrote:Hi,
I have just found the value of nr_cpu_ids is 32, instead of 16 on my
new Dell PowerEdge R905 which has 16 cpus (4 quad-core Opteron
8380). However, /proc/cpuinfo displays the right number (16).
I have searched the archive but found no related subject. Is there
any patch already available to fix the problem?
I am using 2.6.31-4 and verified this incorrect value (32) using a
module.
nr_cpu_ids is set to CONFIG_NR_CPUS on SMP kernels and denotes the max
CPUs supported by your kernel. This is not a bug but a configurable
option in the kernel for saving memory.
You can still set CONFIG_NR_CPUS in "-> Processor type and features" to
the max number of cores N you have on your machine if you want to save
approx 8*N KB. But guessing from your quadsocket configuration, memory
shouldn't be that scarce on that machine to go the trouble :).
--
Regards/Gruss,
Boris.