skylake improved hyperthreading?

[themaniac]

so i heard/read this somewhere dont remember where or when but i remember reading/someone saying that skylake improved hyperthreading, is that true?

[AresKrieger]

so i heard/read this somewhere dont remember where or when but i remember reading/someone saying that skylake improved hyperthreading, is that true?

It has an alternate hyperthreading use that allows it two have two (or more) cores working on one thread which would improve performance on single thread programs turns out it's not real 

Edited September 21, 2015 by AresKrieger

[CommandMan7]

Probably taking bout this...

http://linustechtips.com/main/topic/431734-rumor-skylake-can-virtualise-the-entire-cpu-to-act-as-a-single-thread-inverse-hyper-threading%E2%80%99-24-times-faster/page-4

 

 

 

Not an actual thing in real life benchmarks. It just has the normal ~10% increase in IPC over Haswell.

[Manny Calavera]

It has an alternate hyperthreading use that allows it two have two cores working on one thread which would improve performance on single thread programs

where can i get info on that?

[themaniac]

Probably taking bout this...

http://linustechtips.com/main/topic/431734-rumor-skylake-can-virtualise-the-entire-cpu-to-act-as-a-single-thread-inverse-hyper-threading%E2%80%99-24-times-faster/page-4

 

@https://twitter.com/ryanshrout/status/633686084174548992

 

 

It has an alternate hyperthreading use that allows it two have two cores working on one thread which would improve performance on single thread programs

i know about that but i heard that they improved hyperthreading so that the extra threads are stronger than they used to be

[AresKrieger]

where can i get info on that?

Apparently it's been denounced by intel aka it's fake, however independent test have been able to crank some performance with this method, so skylake could do it but apparently it's not a feature

 

i know about that but i heard that they improved hyperthreading so that the extra threads are stronger than they used to be

Yes the threads are better, by how much idk

[themaniac]

they're always working on the IPC count, so if the IPC has gone up, all the threads will be stronger than before

but i heard that they improved hyperthreading so that the extra threads are not as weak compared to the physical cores on the cpu

[Glenwing]

The "reverse hyperthreading" does not exist, it was a completely made-up rumor based on pure speculation, which has already been retracted by the original source of the rumor. They got one strange result on a single section of one benchmark, and started jumping to conclusions, which ultimately turned out to be completely wrong. They were corrected by Intel themselves at the IDF event where Skylake was officially covered.

Original source of the rumor: http://www.heise.de/newsticker/meldung/Skylake-mit-inversem-Hyper-Threading-2779793.html

Later update from same source: http://www.heise.de/newsticker/meldung/IDF-2015-Intel-enthuellt-ein-wenig-die-Skylake-Architektur-2784862.html

Translated:

 

Inverse Hyper-Threading, as speculated here due to strange measurement results, is not supported by Skylake. Other improvements are responsible for the sometimes considerable acceleration of single-thread applications