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-   -   768k Skylake Problem/Bug (https://www.mersenneforum.org/showthread.php?t=20714)

chalsall 2016-01-11 01:55

[QUOTE=0PolarBearsHere;421855]Yep. Hitting the tech blogs.
[url]http://www.lifehacker.com.au/2016/01/bug-affecting-intel-skylake-processors-can-freeze-computers-running-complex-workloads/[/url][/QUOTE]

If I may please share...

I find it a bit interesting that your linked news source referenced both Scientific and Financial use of compute....

Prime95 2016-01-11 02:15

[QUOTE=chalsall;421422]Great job everyone!

Yet another example that persistence, and the scientific method, works! :smile:

Edit: Oh, and that George writes _awesome_ code.... :tu:[/QUOTE]

And special kudos to the German testers that found the problem in the first place. They did an excellent job in eliminating possible causes before bringing it to our attention.

chalsall 2016-01-11 02:25

[QUOTE=Prime95;421862]And special kudos to the German testers that found the problem in the first place. They did an excellent job in eliminating possible causes before bringing it to our attention.[/QUOTE]

Indeed. We wouldn't even have realize this was an issue until they brought it to our attention.

Aurum 2016-01-11 12:29

The microcode update 0x6A (or higher) should solve the problem. We will see when the new Bios is released.

Enectic 2016-01-11 15:05

Hey everyone, so does this only affect Skylake processors with hyperthreading? From my understanding, after reading through the thread, it seems like that's the case however when you read Intel's statement they state it "affects the 6th Gen Intel Core family of products" which makes it sound like every Skylake processor. I ask because I'm running a core i5-6500 (no hyperthreading) and I've completed 13+ hours of small FFT but I always crash after around 6 hours of the blend test. It always seems to be around the 6 hour mark and prime stops responding and then my system is pretty much frozen (can still move cursor around but can't do anything). I first thought it was instability so I didn't take note of the test it crashed at and have been doing a combination of lowering my overclocks/increasing voltage the past couple of runs but it still seems to crash. Right now I'm running it again with my RAM at stock (XMP was on and it had a very slight overclock the past few runs) to see if it still crashes. This time if it does I'll take note of the test it was currently executing.

Xyzzy 2016-01-11 15:14

[url]http://arstechnica.com/gadgets/2016/01/intel-skylake-bug-causes-pcs-to-freeze-during-complex-workloads/[/url]

chalsall 2016-01-11 15:20

[QUOTE=Enectic;421911]Hey everyone, so does this only affect Skylake processors with hyperthreading? From my understanding, after reading through the thread, it seems like that's the case however when you read Intel's statement they state it "affects the 6th Gen Intel Core family of products" which makes it sound like every Skylake processor.[/QUOTE]

Those who found the bug, and then those who were able to reproduce it, found that hyperthreading had to be enabled. Also, it only manifested when Prime95 / mprime was running a 768K FFT using the AVX code path.

However, Intel obviously have a much deeper understanding of the issue, so it's possible that other software might encounter the issue without hyperthreading enabled.

kracker 2016-01-11 16:15

What's with the insane number of people viewing this thread over the last few day or so? :surprised:
[code]Currently Active Users Viewing This Thread: 191 (3 members and 188 guests)
[/code]EDIT: Heh new avatar... just noticed :razz:

Dubslow 2016-01-11 16:27

It's because various press articles are reporting this thread as the original discovery, which while not quite true, is definitely attracting traffic.

Mark Rose 2016-01-11 18:33

[url]http://www.theregister.co.uk/2016/01/11/math_bug_splatters_skylake_intel_working_on_fix/[/url]

Aurum 2016-01-11 19:06

[URL]http://winfuture.de/news,90525.html[/URL]
[URL]http://www.computerbase.de/2016-01/prime95-intel-erkennt-stabilitaetsproblem-bei-skylake-cpus-an/[/URL]
[URL]http://www.heise.de/newsticker/meldung/Intels-Skylake-Prozessoren-bleiben-manchmal-haengen-3068461.html[/URL]
[url]http://www.hardwareluxx.de/index.php/news/hardware/prozessoren/37781-skylake-prozessoren-komplexe-berechnungen-koennen-zu-abstuerzen-fuehren.html[/url]


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