On Wednesday 11 January 2006 12:25, Joachim Schrod wrote:
Hello,
I have a system with a Pentium P4 and an Intel D865GBF mainboard. The CPU has hyperthreading, but this is disabled in the BIOS. (The system got delivered that way. I bought it w/o any operating system.)
Nevertheless, SUSE 10.0 seems to detect Hyperthreading, since it uses an SMP kernel. Also, /proc/cpuinfo contains the lines
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz stepping : 1 cpu MHz : 2993.250 cache size : 1024 KB physical id : 0 siblings : 2 core id : 0 cpu cores :
I don't think it's working for you. You should see two processors listed. Here's mine: cat cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping : 9 cpu MHz : 2800.390 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr bogomips : 5614.93 processor : 1 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping : 9 cpu MHz : 2800.390 cache size : 512 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid xtpr bogomips : 5589.26 You would also need dual channel memory. Try enabling it in the bios and see what happens. If you can't enable it, then your hw probably isn't capable of it.
1
where -- as far as I understood -- a `siblings' line with a value >1 denotes hyperthreading.
So, is it necessary to enable hyperthreading in BIOS, or does Linux just ignore that setting and utilizes the CPU's full capabilities anyhow?
TIA for any answer,
Joachim
-- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Joachim Schrod Email: jschrod@acm.org Roedermark, Germany