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Full Discussion: Lost CPU CORES
Operating Systems Linux Red Hat Lost CPU CORES Post 302554916 by fpmurphy on Tuesday 13th of September 2011 10:46:39 AM
Old 09-13-2011
Quote:
Originally Posted by Neo
OK, run this command:
Code:
zgrep SMP /proc/config.gz

On Fedora and downstream, the file you probably want is /boot/config-<name of your kernel>. Also CONFIG_SMP is Y by default - at least on AMD64 (x86_64) platforms. For example, I am using 2.6.40 on a F15 X32 development system, so the name of the configuration file is config.2.6.40.4-5.fc15.x32. (x32 is not a typo, it is a new emerging psABI)

If the OP installs and runs cpuid, we will have a much better idea of what the actual cpus think they are. I suspect that cpuid will return the expected values but I think we should eliminate this possibility or that some cores have been disabled by the BIOS. BTW, There was an interesting discussion on FreeBSD back in 2010 re E5530s and missing cores. Search for "FreeBSD, E5530 cpuid acpidump." Turns out that the missing cores were disabled by a BIOS setting.
 

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PAPI_hw_info_t(3)						       PAPI							 PAPI_hw_info_t(3)

NAME
PAPI_hw_info_t - Hardware info structure. SYNOPSIS
Data Fields int ncpu int threads int cores int sockets int nnodes int totalcpus int vendor char vendor_string [128] int model char model_string [128] float revision int cpuid_family int cpuid_model int cpuid_stepping int cpu_max_mhz int cpu_min_mhz PAPI_mh_info_t mem_hierarchy int virtualized char virtual_vendor_string [128] char virtual_vendor_version [128] float mhz int clock_mhz int reserved [8] Field Documentation int PAPI_hw_info_t::clock_mhz Deprecated int PAPI_hw_info_t::cores Number of cores per socket int PAPI_hw_info_t::cpu_max_mhz Maximum supported CPU speed int PAPI_hw_info_t::cpu_min_mhz Minimum supported CPU speed int PAPI_hw_info_t::cpuid_family cpuid family int PAPI_hw_info_t::cpuid_model cpuid model int PAPI_hw_info_t::cpuid_stepping cpuid stepping PAPI_mh_info_t PAPI_hw_info_t::mem_hierarchy PAPI memory heirarchy description float PAPI_hw_info_t::mhz Deprecated int PAPI_hw_info_t::model Model number of CPU char PAPI_hw_info_t::model_string[128] Model string of CPU int PAPI_hw_info_t::ncpu Number of CPUs per NUMA Node int PAPI_hw_info_t::nnodes Total Number of NUMA Nodes float PAPI_hw_info_t::revision Revision of CPU int PAPI_hw_info_t::sockets Number of sockets int PAPI_hw_info_t::threads Number of hdw threads per core int PAPI_hw_info_t::totalcpus Total number of CPUs in the entire system int PAPI_hw_info_t::vendor Vendor number of CPU char PAPI_hw_info_t::vendor_string[128] Vendor string of CPU char PAPI_hw_info_t::virtual_vendor_string[128] Vendor for virtual machine char PAPI_hw_info_t::virtual_vendor_version[128] Version of virtual machine int PAPI_hw_info_t::virtualized Running in virtual machine Author Generated automatically by Doxygen for PAPI from the source code. Version 5.2.0.0 Tue Jun 17 2014 PAPI_hw_info_t(3)
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