[Cialug] Where'd all the CPUs go?

[Dave Weis]

Sorry for the empty message earlier, when the kernel is compiled there 
is a setting for how many CPU's to support with the kernel. There's some 
amount of memory overhead to support each processor. You might be able 
to edit the kernel source RPM and increase the number of allocated 
processors.

Alternatively, pull half of them out and use them for door prizes at the 
next LUG meeting.

Nathan Smith wrote:
> I have a box with 8 Xeons that are hyperthreaded.  When I install Centos, cat/proc/cpuinfo shows 16 CPUs.  I just installed Ubuntu 8.04 server and it is showing 8 CPUs.
> 
> How can I determine if this is a difference between how cat /proc/cpu is reporting it or whether hyper threads are disabled on Ubuntu?
> 
> Dmesg also has a message that says:
> Processor #1 15:2 APIC version 20
> WARNING: NR_CPUS limit of 8 reached.  Processor Ignored.
> ACPI: LAPIC (acpi_id[0x0a] lapic_id[0x03] enabled)
> 
> I found this page http://www.livingubuntu.com/?p=44 and tried these instructions along with just changing the kernel line in menu.1st.
> 
> I'm not sure what to check/try next.
> 
> -Nate
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