[solved] CPU #1 not responding - cannot use it.

[ttolstead]

My install of Kubuntu 8.04 kernel 2.6.24-116-generic is not able to use the second core of my Athlon 64x2 5000+ processor. The pc is a Dell 531s with 2gb of ram. I have been trying to find a fix for this but no joy. It seems that this is happening in other distributions too.

This is a snippet of the output from dmesg:

[ 49.748924] ACPI: Core revision 20070126
[ 49.748971] ACPI: Looking for DSDT in initramfs... error, file /DSDT.aml not found.
[ 49.752784] CPU0: AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ stepping 02
[ 49.752799] SMP alternatives: switching to SMP code
[ 49.753118] Booting processor 1/1 eip 3000
[ 69.070379] Not responding.
[ 69.070383] Inquiring remote APIC #1...
[ 69.070384] ... APIC #1 ID: 1000000
[ 69.070485] ... APIC #1 VERSION: 80050010
[ 69.070586] ... APIC #1 SPIV: ff
[ 69.070687] CPU #1 not responding - cannot use it.
[ 69.070699] Total of 1 processors activated (5228.70 BogoMIPS).
[ 69.070928] ENABLING IO-APIC IRQs

Does anyone have any suggestions regarding this?

[ttolstead]

Re: [solved] CPU #1 not responding - cannot use it.

By trying both the Hardy i386, and the AMD 64 versions, I have come to the conclusion that i386 will not use both cores on my 5000+. This is a little confusing as both kernels are identified as "Generic", I was trying the i386 version as it is 32 bit, and I have had compatibility issues with the 64 bit versions in the past. In Gutsy I had to load a "Generic" kernel to get dual cores to function. Anyhoo, I figured it out, just thought I would answer my own question.

[dibl]

Re: [solved] CPU #1 not responding - cannot use it.

I have never heard or seen that an AMD CPU can run the i386 architecture -- I think they HAVE to have the "AMD64" architecture to work correctly. Intel 64-bit CPUs, on the other hand, can run either architecture.