Re: Quad core CPU detected but shows as single core in 2.6.23.1

[Chris Snook <csnook@redhat.com>]

Zurk Tech wrote:
> Hi guys,
> I have a tyan s3992 h2000 with single barcelona amd quad core cpu (the
> other cpu socket is empty). cat /proc/cpuinfo shows amd quad core
> processor
> but core : 1....ive compiled the kernel from scratch with smp and
> amd64 + the numa stuff. i also tried debian etchs amd64 smp kernel and
> same result.
> is amd barcelona quad core cpu not yet supported or is it something else ?
> Thanks for any insight. im completely stumped. ive dealt with
> mutliprocessing machines before and have a couple of dual cores which
> are fine with the
> exact same kernel configs. my amd tk-53 x2 turions show 2 cores in cpuinfo....

The bootstrap protocol for Barcelona is a little different from older Opterons, 
so an older BIOS that doesn't know the new protocol won't be able to bring up 
any CPU other than the bootstrap processor.  My wild guess is that this is 
what's happening and a BIOS update will fix it, but as Arjan said, please post 
dmesg when reporting bugs like this.

	-- Chris