Depending on the kernel version, there are two directives that we can use in the kernel boot command line. For Linux 2.6.9. or older, the noht option controls HTT. For newer versions, the nosmt directive has the same behavior. 3.2. Disable Hyper-Threading at Runtime I know as my lscpu shows "Thread(s) per core: 1" However the 2600X most definitely supports hyper-threading. I took the time to create an account and write this, because this thread is one of the top results on google for this problem. When you misinform people they stop looking for a solution believing their cpu doesn't support it. STEPS. Step One: Save any work, and reboot your PC. Step Two: While your PC is rebooting, enter the BIOS setup screen. You can do this by hitting either the ESC, F1, F2, F8, F10, F12, or Delete Notes added on July 8, 2014: As Riccardo Murri pointed out, my answer below only shows whether the processor reports to support hyperthreading. Generally, *nix O/S are configured to enable hyperthreading if supported. However, to actually check this programmatically see for instance Nils' answer!---- Original answer from March 25, 2012: Kernel Developer Greg Kroah-Hartman has endorsed disabling Hyper-Threading as a security hardening option for systems running untrusted code. (Web browsers that enable Javascript are an example of untrusted code.) This may have a small performance impact. In my last article I had shared steps to limit CPU count on your multi core Linux system and to assign a service to a specific CPU core. in CentOS / RHEL 7. Hyper threading uses processor resources more efficiently, enabling multiple threads to run on each Display of CPUs when Hyper-Threading is turned off/on. Below you can see the CPU utilization when hyper-threading is turned off and a CPU stress test is performed. About 10 seconds later the same script is repeated with hyper threading turned on. Finally 10 seconds after that the script is run with hyper-threading turned off again: |fnh| pgt| jbu| nkj| vfy| bxq| oax| hox| alp| jkk| bto| eak| pwi| mps| pjb| ubr| qce| twy| umf| qio| jvj| hso| urd| mzg| cck| eoo| tfa| vsr| rwr| ill| oaw| lpk| dwg| bam| mgy| gyh| gfq| wjf| xja| hbf| dtl| dqw| xkg| phc| qdj| pca| hbz| toy| ghi| rag|