on 02/09/2010 11:25 Andriy Gapon said the following: > on 01/09/2010 21:26 Jung-uk Kim said the following: >> On Friday 27 August 2010 03:36 pm, Jung-uk Kim wrote: >>> [3] AMD is working on an SMT-capable CPU (code-named Bulldozer) and >>> my patch won't work on them. If anyone has a Bulldozer sample, >>> please look into it. >> >> I checked AMD website today and found out a new CPUID Spec. Rev. 2.34 >> was just released: >> >> http://support.amd.com/us/Embedded_TechDocs/25481.pdf >> >> They have added CPUID 0x8000001d and 0x8000001e to detect topology, it >> seems. Also, CPUID 0x80000001 %ecx bit 22 (TopologyExtensions) tells >> you whether the above CPUID functions are supported. >> >> Interesting... > > Yeah, I've heard that they are adding SMT capabilities in "Bulldozer" > processors, so I guess they have to change CPU topology detection indicators.
The above comment by me is almost nonsense :) I looked at the document with better attention and I think that what the new way does is better/provides proper support for discovering non-uniform topologies based on APIC IDs of the cores. BTW, I am reading that AMD Bulldozer CPU package will consist of modules, which in turn will consist of cores. When a "core" would be something in between current notion of core and current notion of hardware thread (SMT/HTT/whatever). The Bulldozer cores will have independent arithmetic units and L1 caches, but shared FPU, L2, fetch+decode and some other elements; L3 cache is per package (shared by all "modules"). -- Andriy Gapon _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"