Comment by justinclift

9 years ago

Hmmm, checking for "ht" seems to be giving weird info. On a i5-750 here (few years old), running Fedora 25:

    $ grep '^flags.*[[:space:]]ht[[:space:]]' /proc/cpuinfo
    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 syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts
    rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2
    ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm tpr_shadow vnmi flexpriority ept vpid dtherm ida

"ht" is being returned even though the CPU only has 4 cores and no hyperthreading:

https://ark.intel.com/products/42915/Intel-Core-i5-750-Proce...

dmidecode seems to give more accurate info for this:

    $ sudo dmidecode -t processor | grep 'Count:'
    	Core Count: 4
    	Thread Count: 4

2 comments

justinclift

decisiveness 9 years ago

It looks like dmidecode also contradicts itself with the hyper threading flag:

    $ sudo dmidecode -t processor | grep -E 'Flags:|HTT|Status|Count'
    	Flags:
		HTT (Multi-threading)
	Status: Populated, Enabled
	Core Count: 4
	Thread Count: 4

justinclift 9 years ago

Hmmm... yeah that's showing the same on mine too. According to dmidecode, this CPU has hyperthreading.