Red Hat Bugzilla – Bug 212978
Incorrect number of CPUs for Pentium D960
Last modified: 2007-11-30 17:11:47 EST
Description of problem: Only 1 CPU is listed under /proc/cpuinfo for a dual-core CPU (Pentium D960) Note: This appears to be unrelated to anaconda bug because of the version of the kernel in use... Version-Release number of selected component (if applicable): Linux 172.16.1.33 2.6.18-1.2798.fc6 #1 SMP Mon Oct 16 14:37:32 EDT 2006 i686 i686 i386 GNU/Linux Actual results: > cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 6 model name : Intel(R) Pentium(R) D CPU 3.60GHz stepping : 4 cpu MHz : 2400.000 cache size : 2048 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 6 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc up pni monitor ds_cpl vmx est cid cx16 xtpr lahf_lm bogomips : 7199.22 Expected results: ( At least ): ... cpu cores : 2 ... Steps attempted to resolve: Removed and reinstalled i686 kernel. ( Thinking it was an anaconda bug. ) Other knowns: Pentium D950 (same motherboard, Intel D965WH, installed as 64 bit returns two core processors (and I think, 2 siblings)
It ocurred to me that I should also add this: Per Intel, I am booting the board with the flags: ALL-GENERIC-IDE PCI=NOMMCONF Since I have no idea what the second one does, I figured I'd mention it.
The BIOS has a setting to force the processor into single processor mode. Unfortunately, it's wording is a little confusing: "Enable single processor mode" "disabled" is the setting to get dual processing power from it.