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.
