On Wed, Jun 10, 2009 at 3:13 PM, Greg<jour...@raven.ontheside.net> wrote: > I've been having trouble determining if my processor has hyper-threading. I'm > thinking that it does. I know that it isn't > a dual-core. > > If it is a hyper-thread processor, I can't seem to figure out exactly how to > enable the hyper-thread under linux. > > First, here's the CPU info from /proc/cpuinfo > > processor : 0 > vendor_id : AuthenticAMD > cpu family : 15 > model : 95 > model name : AMD Athlon(tm) 64 Processor 3800+ > stepping : 2 > cpu MHz : 1000.000 > cache size : 512 KB > fpu : yes > fpu_exception : yes > cpuid level : 1 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca > cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt rdtscp lm > 3dnowext 3dnow up rep_good pni cx16 lahf_lm svm extapic cr8_legacy > bogomips : 2009.87 > TLB size : 1024 4K pages > clflush size : 64 > cache_alignment : 64 > address sizes : 40 bits physical, 48 bits virtual > power management: ts fid vid ttp tm stc > > > I have the gentoo genkernel sources version 2.6.28-r5 currently installed. > The > processor section looks like this: > . . [*] Tickless System (Dynamic Ticks) . . > . . [*] High Resolution Timer Support . . > . . [*] Symmetric multi-processing support . . > . . [*] Enable MPS table . . > . . Subarchitecture Type (PC-compatible) ---> . . > . . [ ] Paravirtualized guest support ---> . . > . . [ ] Memtest . . > . . Processor family (Opteron/Athlon64/Hammer/K8) ---> . . > . . [ ] Supported processor vendors ---> . . > . . [*] Enable DMI scanning . . > . . [*] GART IOMMU support . . > . . [*] IBM Calgary IOMMU support . . > . . [*] Should Calgary be enabled by default? . . > . . [*] AMD IOMMU support . . > . . (32) Maximum number of CPUs (2-512) . . > . . [*] SMT (Hyperthreading) scheduler support . . > . . [*] Multi-core scheduler support . . > . . Preemption Model (Preemptible Kernel (Low-Latency Desktop)) ---> . . > . . [ ] Preemptible RCU . . > . . [*] Machine Check Exception . . > . . [*] Intel MCE features . . > . . [*] AMD MCE features . . > . . < > Dell laptop support . . > . . <M> /dev/cpu/microcode - microcode support . . > . . [*] Intel microcode patch loading support . . > . . [*] AMD microcode patch loading support . . > . . <*> /dev/cpu/*/msr - Model-specific register support . . > . . <*> /dev/cpu/*/cpuid - CPU information support . . > . . [ ] Numa Memory Allocation and Scheduler Support (EXPERIMENTAL) . . > . . Memory model (Sparse Memory) ---> . . > . . [*] Sparse Memory virtual memmap . . > . . *** Memory hotplug is currently incompatible with Software Suspend *** > . . > . . [*] Add LRU list to track non-evictable pages . . > . . [ ] Check for low memory corruption . . > . . [*] Reserve low 64K of RAM on AMI/Phoenix BIOSen . . > . . [*] MTRR (Memory Type Range Register) support . . > . . [*] MTRR cleanup support . . > . . (0) MTRR cleanup enable value (0-1) . . > . . (1) MTRR cleanup spare reg num (0-7) . . > . . [ ] x86 PAT support . . > . . [ ] EFI runtime service support . . > . . [*] Enable seccomp to safely compute untrusted bytecode . . > . . Timer frequency (300 HZ) ---> . . > . . [*] kexec system call . . > . . [ ] kernel crash dumps . . > . . (0x200000) Physical address where the kernel is loaded . . > . . [ ] Build a relocatable kernel (EXPERIMENTAL) . . > . . -*- Support for hot-pluggable CPUs . . > . . [*] Compat VDSO support . . > . . [ ] Built-in kernel command line . . > . ......................... > > I'm sure there are things that should be left out of my kernel as my AMD > probably doesn't support them or need them, but I > have left various things enabled where I wasn't sure. > > Any suggestions or thoughts are welcome. Like I said, I'm pretty sure it > should have hyperthreading, but it doesn't show > it in the current configuration and all searches have yielded unhelpful > results.
AMD chips don't have hyperthreading, just hypertransport which is something completely different. If it did you'd see a processor 1 in cpuinfo. Wil
