[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-threading
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[WARNING] Intel Skylake/Kaby Lake processors: broken hyper-t
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Re: [WARNING] Intel Skylake/Kaby Lake processors: broken hyp
It's times like this that I'm glad I have my troll-worthy Pentium G3258
Bookworm | Intel I7-3667U | Apple Macbook Air 5,2 (Mid 2012) (Laptop) | 8 GB RAM | 3rd Gen Intel Core Graphics
- ticojohn
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Re: [WARNING] Intel Skylake/Kaby Lake processors: broken hyp
I am using Intel i5 processors in both of my computers. i5 processors are supposed to NOT support hyper-threading. When I look at, for instance, cat /proc/cpuinfo I see that there are 4 cores and 4 siblings, ergo no hyper-threading. However, when I look at the flags, in /proc/cpuinfo, I see that the ht flag is set. Isn't that strange? Maybe a bios setting although I don't find anything called Hyper Threading. And NO, I am not looking for a support answer. It's more of a rhetorical question.
I am not irrational, I'm just quantum probabilistic.
Re: [WARNING] Intel Skylake/Kaby Lake processors: broken hyp
The story about it I read suggested this was not a very big deal - invoked only in specific, rare use cases.
Nobody would ever ask questions If everyone possessed encyclopedic knowledge of the man pages.
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Re: [WARNING] Intel Skylake/Kaby Lake processors: broken hyp
It depends on the type of i5 processor as to whether it supports hyperthreading or not. Mine happens to.
I already installed the intel-microcode update that's supposed to fix it in Linux, as well as the "BIOS" update from Acer from the 26th that I suspect fixes it for the machine overall. I noticed that the BIOS updater seems to have changed from a Windows-only program to a DOS one that Linux users can use FreeDos to install, so Acer deserves some kudos for that.
Code: Select all
inxi -x -C
CPU: Dual core Intel Core i5-6200U (-HT-MCP-) cache: 3072 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 9600
clock speeds: max: 2301 MHz 1: 400 MHz 2: 2300 MHz 3: 2300 MHz 4: 400 MHz
MX Linux packager and developer
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Re: [WARNING] Intel Skylake/Kaby Lake processors: broken hyp
Right on Steve. I am using 4th and 5th generation i5 processors which do not support hyperthreading. I believe that hyperthreading for the i5 was introduced in 6th generation, however there might have been some 5th gen processors that supported it. Still wish I knew why the "ht" flag is set even though the CPU I have doesn't support it. I've gone through the BIOS and find no reference to hyperthreading. Might be called something else, maybe Virtualization?stevepusser wrote:It depends on the type of i5 processor as to whether it supports hyperthreading or not. Mine happens to.
Whatever, they work and I'm not messing with what ain't broken.
I am not irrational, I'm just quantum probabilistic.
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Re: [WARNING] Intel Skylake/Kaby Lake processors: broken hyp
After doing some checking I find that i5 processors with 4 cores do not hyperthread. The i5 processors with 2 cores, such as yours, do have hyperthreading. If the 4 core i5 had hyperthreading it would essentially be an i7.stevepusser wrote:It depends on the type of i5 processor as to whether it supports hyperthreading or not. Mine happens to.
I am not irrational, I'm just quantum probabilistic.