Arch Linux

ice9

Member

Registered: 2010-04-16

Posts: 14

Arch only detecting 1 CPU 1 core instead of 16 processors

EDIT:

It turns out it was a BIOS problem. I flashed to a different BIOS and reset everything to default settings in the BIOS, and now all 16 processors are recognized.

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I have a system with an Asus Z8PE-D18 motherboard with 2 Xeon E5520 CPUs. Each CPU has 4 cores and 8 threads, so linux SMP should see 16 processors. But my recent Arch linux install only sees 1 CPU 1 core. Is this a kernel bug, or is something not configured properly? I have another similar machine running Ubuntu that sees all 16 processors, and the only difference I see offhand is that uname -a gives "SMP" but not "SMP PREEMPT" as shown below. Is that significant?

I'm new to Arch linux. What is the best way to try a different kernel without compiling it myself? Any suggestions on a kernel package to try?

# uname -a
Linux server 2.6.33-ARCH #1 SMP PREEMPT Sun Apr 4 10:27:30 CEST 2010 x86_64 Intel(R) Xeon(R) CPU E5520 @ 2.27GHz GenuineIntel GNU/Linux

# cat /proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family    : 6
model        : 26
model name    : Intel(R) Xeon(R) CPU           E5520  @ 2.27GHz
stepping    : 5
cpu MHz        : 1599.845
cache size    : 8192 KB
physical id    : 0
siblings    : 1
core id        : 0
cpu cores    : 1
apicid        : 0
initial apicid    : 0
fpu        : yes
fpu_exception    : yes
cpuid level    : 11
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc up arch_perfmon pebs bts rep_good xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt lahf_lm ida tpr_shadow vnmi flexpriority ept vpid
bogomips    : 3200.01
clflush size    : 64
cache_alignment    : 64
address sizes    : 40 bits physical, 48 bits virtual
power management:

Last edited by ice9 (2010-04-18 07:33:32)