What does HT on Intel boards denote?

Answer 1

Hyper Threading

Hyper-threading, officially called Hyper-Threading Technology (HTT), is Intel's trademark for their implementation of the simultaneous multithreading technology on the Pentium 4 microarchitecture. It is basically a more advanced form of Super-threading that debuted on the Intel Xeon processors and was later added to Pentium 4 processors. The technology improves processor performance under certain workloads by providing useful work for execution units that would otherwise be idle, for example during a cache miss.

Hyper-Threading works by duplicating certain sections of the processor—those that store the architectural state—but not duplicating the main execution resources. This allows a Hyper-Threading equipped processor to pretend to be two "logical" processors to the host operating system, allowing the operating system to schedule two threads or processes simultaneously. Where execution resources in a non-Hyper-Threading capable processor are not used by the current task, and especially when the processor is stalled, a Hyper-Threading equipped processor may use those execution resources to execute the other scheduled task. (The processor may stall due to a cache miss, branch misprediction, or data dependency.)

Except for its performance implications, this innovation is transparent to operating systems and programs. All that is required to take advantage of Hyper-Threading is symmetric multiprocessing (SMP) support in the operating system, as the logical processors appear as standard separate processors.

However, it is possible to optimize operating system behaviour on Hyper-Threading capable systems, such as the Linux techniques discussed in Kernel Traffic. For example, consider an SMP system with two physical processors that are both Hyper-Threaded (for a total of four logical processors). If the operating system's process scheduler is unaware of Hyper-Threading, it would treat all four processors the same. As a result, if only two processes are eligible to run, it might choose to schedule those processes on the two logical processors that happen to belong to one of the physical processors. Thus, one CPU would be extremely busy while the other CPU would be completely idle, leading to poor overall performance. This problem can be avoided by improving the scheduler to treat logical processors differently from physical processors; in a sense, this is a limited form of the scheduler changes that are required for NUMA systems.

Answer 2

Hyper Threading:
A single processor supporting Hyper-Threading Technology presents itself to modern operating systems and applications as two virtual processors. The processor can work on two sets of tasks simultaneously, use resources that otherwise would sit idle, and get more work done in the same amount of time.

"that is, the processorcan process two jobs at a time... or do two things at the same time..."

Answer 3

Hyper threading, its 1 processer acting like 2

Answer 4

Hyper Threading supported!

Answer 5

It represents Hyper-Threading Technology.

Hyper-Threading Technology is making one physical processor act like two logical processors using any unused resources during execution resulting in more work done in less time.

Answer 6

Hyperthreading.

Answer 7

it represents hyper threading technology...